A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

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

The world's longest known cave system.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

You thought Santa Claus didn't exist, but it turns out you were wrong.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

Kentucky's longest operating jail is now a spooky spot to spend the night.

This railroad overpass is said to be home to a murderous goat-man whose very legend has led to very real deaths.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

This abandoned cemetery has a dark past of bodies buried over bodies.

A curiosity-seeker's paradise set inside a three-story historic school house.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

This candy shop has been serving up sweets to the Louisville area since the 1850s.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.