Purple thistles, California poppies, clover, and dandelions have all taken root in the roughly 10-inch-deep, lightweight humus and grape-husk soil in this 580-square-foot green roof. Designer Peter Liang says that he "wanted to plant a green roof for its thermal mass, but I wanted it to be as natural as possible."

Suzanne and Brooks Kelley at the back of their 1,100-square-foot guest cottage.

The owners toured this home, which surrounds a mature tipu tipu tree, while visiting relatives for the day. The brick is original to the 1947 construction.

Sliding doors by Quantum were made to look like the original panes that couldn't be saved, and they lead to a fire pit outside.

The view!

At the top of the stairwell, a sitting area is outfitted with a vintage Eames lounge, a large Jack Goldstein painting, and a 1970s light fixture found by Marcovitz in Paris.

The kitchen features a concrete island topped with marble. Deja-Vu stools by Naoto Fukasawa surround the island. A print by Guy Gormley, as well as a painting bought during holiday in St. Tropez, hang on the walls.

Take a look at some of the most exciting, sustainable buildings around the world, and you may notice something they have in common: green roofs, or rooftops covered with a thin layer of soil to allow for grasses and other low-lying plants to grow.

New Depths Inspired by a local winery, George Kyprianou wanted a glass top on his subterranean wine cellar. The interior is lit, casting soft light into the living space at night and revealing the 132-year-old stone foundation. The three-quarter-inch glass lid sits flush with the floorboards; it opens with an ingenious device that Kyprianou devised using a 12-volt air compressor and a remote-controlled switch. When you push the button, the glass lifts just enough to be removed by hand.

1º and 2º Floor

3º and 4º floor

Light Box Peter created a simple uplight at the top of the wood box by wiring together energy-efficient fluorescent fixtures typically used under cabinets and countertops. “The cheaper magnetic models hum unacceptably loudly, so make sure you get the electronic ballast types,” he warns. He then painted the cavity white to reflect light and covered them with quarter-inch-thick acrylic from TAP Plastics. homedepot.com tapplastics.com

The view of Kapiti Island is fully revealed from the tower.

The top container contains Wardell's office—and a "napping nook" above that.

In the dining area, a one-of-a-kind table with a reclaimed Carrara marble top by NET—themultidisciplinary design firm of architect Alejandro Sticotti, with whom Nicolas works—is surrounded by prototypes of the company’s Board chair. The family dog, China, sits on a floor made of travertine tiles.

The architects added a small circular skylight to serve as a vertical focal point in the center of the fifth floor. The quarter-sawn white oak risers produce a beautiful rippled grain highlighted by the abundant natural light.

This phenomenal site offers 270º views acrosse the Andes

Visitors enjoy a 360º panorama at the tower's peak.

The Kelleys furnished the cottage with help from Suzanne’s daughter Betsy Burbank of Betsy Burbank Interiors. Classic modernist icons, such as a Saarinen Womb chair for Knoll, a Herman Miller Eames lounge chair, and an Eileen Grey E1027 side table look at home alongside present-day pieces such as an Encore sofa (which handily folds down into a sleeping surface) from Room & Board and a Doka rug designed and produced by Stephanie Odegard. The Wohlert pendant lights from Louis Poulsen were designed by Vilhelm Wohlert in 1959, but grouped as such, they appear distinctly contemporary.

The façades rotated 45º with respect to the orthogonal limits of the plot.

Corrugated metal siding bent 90º around the corner, an innovative product called Formflow C90

The 45º furniture collection by Blu Bathworks is handcrafted with quality and sustainable materials with the lowest formaldehyde emissions in the world.

The yellow North Face tent looms over the top of the main building.

Yvette, Adrian, and their son Julian survey the view from the top-floor terrace. “I’ve never been fond of modernism—I find it cold,” Adrian admits. “But having this house, I have to say, it’s growing on me.”

Still, it’s possible to remove or relocate non-structural walls in a home with good bones.

The master bedroom occupies a private space on the top floor.

A Nelson jewelry cabinet and Massimo Vignelli lamp.

The Piranesian view upwards through the central stair to the top floor skylight.

Faro is a minimalist table lamp created by Valencia-based designer LaSelva. It is divided in two parts, the base and the lampshade without the use of any hardware. The cylindrical marble base has a magnet at the top, surrounded with a thin felt, to allow the shade to stay in the desired position. The lamp shade can rotate 360º in horizontal and 45º in vertical keeping the base in the same spot. The spherical shape of the shade makes it possible for it to pivot from the base adopting various positions. The shade is closed with a translucent polypropylene. The metal shade finishes include black matte, black chrome, and antique brass.

Integral glass counter and sink top

Can't find the right table for your space? Another option is to have a custom top cut for a recycled base, which is what the Deams did for their outdoor dining area. They had an existing Scissor table base by Bay Area designer John Randolph sitting unused, so Chris had a piece of hardy soapstone (it stands up to high temperatures) cut to match by Fox Marble. A subtle facet at each corner plays off the base's design and lends a more intimate feel to the long table. For a fraction of the cost of a full piece, the bases of design classics are often available on Craigslist and eBay.

The bedroom and bathroom make up the private zones on the top floor.

With an angled roof designed to resemble the surrounding cliffs, a house in Maui, Hawaii, is built to meld with the landscape.

A trap-door opening at the top of the house allows for better circulation.

Enjoy fresh mountain air and get a bird’s eye view of the Himalayas at Shakti 360º Leti – four private stone, glass and wood cabins high on the peaks of the India-Nepal border.