America's smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

An occult-y, historic hotel with the World's Largest Ouija board on the roof.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

An astounding collection of medical specimens, including bits of President Lincoln.

FDR's Art Deco hospital tower was hopelessly inefficient.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

These unusual rooms on wheels are holdovers from the 1960s.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

This abandoned Victorian-style house was built in 1884.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A relic of FDR's brief foray into utopian urban planning.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

After hundreds of years of settlement, this once-bustling fishing village sunk into the Chesapeake Bay.

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

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."