The world's most active stratovolcano is almost always erupting.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

This natural gas vent certainly earns its name as the smallest volcano in Italy.

An obscure waterfall that looks like something out of a fantasy novel.

This tunnel entrance is built to resemble a grand castle but no one is quite sure why.

A petite castle folly in the English countryside.

These giant mummies are set ominously into a Peruvian cliffside and topped with real human skulls.

This roadside attraction attracts kids with dinosaurs before blindsiding them with geology.

A museum honoring Oklahoma military service, where you can look into Hitler's mirror and see a Mickey Mouse gas mask.

Center filled with hands-on displays served as a tribute to several astronauts with connections to the state.

If you are looking for a used Russian battery, Chinese Ham Radio or other electronic oddities this Flea Market is a good place to start.

This highest peak in New Mexico is named after an explorer who had a habit of lending his monicker to peaks.

The largest dinosaurs in the world, kissing above the highway.

Longest canal tunnel in the world, abandoned in the 1960s.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

An auroral research program that superheats the ionosphere.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

Mysterious meeting place for UFO hunters near Area 51.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Hidden beneath the streets of London is a secret subway that only carried mail.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

Curious rock formations in a tiny Kansas state park.