An architect's childhood fantasy treehouse made real.

Stumps of an Ice Age forest, visible only at low tide.

The ghostly remains of what was once the world's richest copper mine.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

A ghost town originally established and governed solely by Black Americans seeking a place of their own, free from discrimination.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

An abandoned town is hidden in Great Smoky Mountains National Park.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

Home to a full-scale replica of the Ezekiel Airship, an aircraft that allegedly flew in 1902—a year before the Wright brothers took to the skies over Kitty Hawk.

This innocent-looking townhome is actually a subway exit.

An Industrial Revolution-era public work that purified water using nothing but sand.

Made from local Irish moss, this pie is served only in Prince Edward Island's potato museum.

A monument to a Native American leader who was known for never breaking a promise and met his end after signing a deal with white settlers.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

A retro walk through the history of the tube.

See the nearly two-century-old ruins of pre-railroad America at the former site of a lock on the Ohio and Erie Canal.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

An unassuming 13-acre park is home to over 12,000 roses.

This whimsical campus lawn is dotted with large sculpted numbers and hidden mathematical formulas.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

This stone, said to have once been a young woman, is sacred to the Dakota and Lakota nations.

A regular looking rock with an unbelievable history.