Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

The highest point in Indiana is curated by an Eagle scout but may be in danger of losing its record to a nearby garbage pile.

Just another ancient, mysterious Irish stone circle.

Petrified footprints of one of the very first vertebrates to walk on land.

This stuffed pigeon of war had the very serious name "John Silver" until he lost a leg in battle.

A hugely vast Irish landscape of barren rock that stretches for miles.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

A former major munitions plant that has been converted into a sprawling art space.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

At 207 feet, one of the world's longest continuous escalators.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Less a museum than a bizarre fantasy world created by artists and engineers.

The largest earthwork effigy in the world.

Elevated freight railway turned wildly successful urban park.

The site of the climactic scene from the classic horror film is now a historic landmark.

A giant Troll lurks under one of Seattle's oldest bridges.

All of Chicago's wood-paved streets are long gone but two alleys remain.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

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

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.