On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

An urban laboratory.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This beautifully deceptive waterfall is something far different from what it appears to be.

The stoutest tree in the world.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

The once highest point in China blends symbolic design with a kick of adrenaline.

A son-and-daughter meat market, hawked by mom and dad.

A giant scale model giving a sneak peek at what urban planners see for Shanghai by 2020.

An out-of-place slice of France, smack in the middle of Shanghai.

An collection of Chinese propaganda posters from 1949 to 1979.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

A sprawling nature preserve harbors the world's only living dragons.

Sacred waters rescued from the wrath of a volcano.

This Balinese sea temple is thought to be guarded by the hundreds of monkeys that live around it.

Hundreds of Buddhas in a re-discovered Indonesian temple.

This $62 million dollar temple was erected to house one little dental fragment of religious history.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

An extraordinary "City of Caves" carved from solid stone.