This tall and trim architectural oddity is one of the skinniest buildings in San Francisco.

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.

A unique market that brings together various goods and cultures.

Worker-owned cooperative and resource for those looking to lighten their ecological footprint.

The natural hot spring that was integral to the creation of Canada's first national park.

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.

This natural wonder is disappearing at an alarming rate.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

Only hotel where you can legally launder money.

Early prototype for Frank Lloyd Wright's Guggenheim.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

San Francisco's newly reopened hands-on science museum.

An urban laboratory.

This Native American settlement dates back to the Pueblo II period.

More than a century old, this trading post resides in the Navajo Nation.

This historic national park is covered in the stunning ruins of red rock pueblos.

A spiritual vortex among the red rocks in Sedona.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.