The ruins of a medieval monastery named after a type of tree.

An abandoned faux-pub made famous by a Guinness commercial.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

America's post-nuclear-attack chambers of Congress.

A small poultry graveyard in the courtyard of a popular Key West watering hole.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

Limestone caves with spectacular showcase chambers.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

These beautiful wineries were at the center of Lake Erie's "grape belt" back when the Midwest dominated American wine production.

Small, privately owned island divided between Michigan and Ohio with abandoned vacation homes and a derelict lighthouse.

Deep scars on the earth left by the Ice Age.

Take a drunken tour inside the world's largest known geode.

A sacred Ojibwe site covered in pictographs next to Lake Superior.

This giant roadside goose has been hailing travelers into a small Ontario town for over 50 years.

Profile of a sleeping person four kilometers long in 250-meter-high cliffs.