A unique seaside cave where Aleister Crowley faked his own death.

A humid oasis combines recreation with exploration in a unique underwater cavern.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A massive underwater sinkhole made famous by Jacques Cousteau.

Stunning wetlands ablaze with pink lotus flowers.

World's largest cave was only discovered in 1991, and now offers tours to the public.

Villagers have recycled bomber fuel tanks from the Vietnam War and turned them into very, very strong boats.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

This unusual lava tube spouts seawater during high surf.

Ride a boat through this magnificent underground world, which now doubles as a theater.

This rustic old building is said to be the most photographed barn in America.

No Gordon Lightfoot song, only a barebones monument to greed.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Magical-looking cottages that inspired one of the most famous animated films ever.

Enormous small-business mecca in the Midwest, serving dozens of artists.

This historic Jewish cemetery sits right in the heart of a Detroit car factory.

A wacky two-story folk-art assemblage of carved and found objects, with lights, motion, and sound now in need of financial support.

A painted-over wall in Detroit originally built to segregate a black community from an adjacent white development.

Where the Model T was made and the assembly line was invented.

The world's oldest operating jazz club has been in operation since May 1934.

This elaborately-carved white marble fountain was built to stand outside the Detroit Opera House.