A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

Walk through the history of American pop culture.

A museum dedicated to exhibiting remarkable outsider art.

A daily replay of the experiment that proved the rotation of the Earth.

A diorama of the Civil War, fought by cats.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

A fitting attraction for the corn capital of the world.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The land is home to swimming ponies and a legendary 18th-century treasure.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

Yo, Adrian!

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.