A monument to an Irish secret society thought to be responsible for a string of violent attacks in Pennsylvania coal mines.

This suburban house is made of dirt, and almost sparked a revolution in home construction.

An eight-sided home built during a brief octagon craze in the 1850s.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

One of the last active volcanoes on the Eastern seaboard.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Visit this playground of waterfalls, caves and sinkholes.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

Home to drunken tower-climbing goats... seriously.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

One of the most acclaimed eateries in Arkansas is a two-table diner on the ground floor of a family home.

The only nuclear weapon assembly and disassembly plant in the U.S.

It's where the final scene of the beloved Tom Hanks movie was filmed.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

Burping, gurgling geothermal mud pots by the Salton Sea.

The wooden airship was the largest flying boat ever built.

Mine your own precious stones.

This old-fashioned roadhouse's quirky neon sign is as famous as its enormous dumplings.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.