Singapore's landscaping project is home to 18 incredible Supertrees.

Futuristic apartment blocks are the backdrop for Montreal surfers hangin' ten on the Habitat '67 standing wave.

Unusual building appears to be haphazardly built from randomly piled bricks.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.

The legendary building that needed ghostly approval before being built.

Peek through a transparent pyramid and drink in the mountain made of books.

The "Prussian Versailles" that is as glorious today as when it was built.

A grassy pyramid named after a French battle.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

Modern-day cave dwellers carve elaborate homes out of volcanic debris.

Mysterious lost empire of the Silk Road.

Ancient human, animal, and geometric figures drawn in the earth.

Once an impressive link to Afghanistan’s Buddhist past, now a sad reminder of intolerance towards other cultures.

What might be the largest completely Jewish town in the world outside of Israel now faces dwindling numbers and empty streets.

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

This Tang Dynasty behemoth is the biggest Buddha in the world.

A complex of six forts embedded in the Rajasthan hills.

This legendary city has been a tourist attraction for centuries.

The oldest Roman lighthouse still in use.

The best-preserved Roman small town in North Africa.

The once great capital of Egypt now crumbles forward as evocative ruins.

The most alien-looking place on Earth.