Bison, America's national mammal, are staging a slow comeback in Ohio's prairie parkland.

Exact replica of the ancient monument, but much, much lighter.

An office built to look like a giant basket.

The largest earthwork effigy in the world.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

The secret city built by the Manhattan Project.

The skeletal white beams stand as a monument to religious dissent.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

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

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

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

An old train trestle re-imagined as an Egyptian obelisk.

The world's largest fully steerable radio telescope.

The record holder for the world’s largest peach.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

Rural churches in the middle of nowhere with religious frescoes by famous artist.

This nine-story building can be played like an instrument.

This North Carolina grave is the final resting place of the world's most famous conjoined twins.

A piece of outsider public art accompanied by a strange urban legend.

A young state senator's deathbed plea to be buried inside a rock resulted in this unusual grave site.

The humble horn finally finds a place in the sun.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.