One of the last free public hot springs is decorated with hippie art.

One of the only cooperatively owned bars in the nation wears its eclectic history on its walls.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

A huge musical instrument played by the ocean.

A monument to the love people have for their pets.

Pick up all of the cosmic knick-knacks under the sun or take a creative writing course, all offered in this novelty storefront.

A deadly ancient portal to the underworld.

The largest catacomb system in the world.

Unusual British home built to disguise a water tower.

The whimsical twist of this spire was either caused by the Devil, an unexpected virgin, or lead.

A psychedelic labyrinth on the San Francisco bay.

Hundreds of mossy stones engraved with bits of philosophy, literature and random musings.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

The final resting place of the world's first nuclear reactor.

A fleet of automotive automatons sleep in this otherwise unremarkable urban garage.

The only surviving prototype for Buckminster Fuller's house of the future.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

According to legend, Bob Dylan sneaks in twice a year to eat dinner with Jack.