Possibly the oldest of Britain's ancient henges is also one of its most stark.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

This picturesque archeological site looks like it was pulled straight from a fantasy novel.

During this Shetland Islands celebration, hundreds of torch-carrying "guizers" lead a procession to burn a viking longboat.

This Shetland Islands bus shelter may be small, but it squeezes in a couch, a desk, some art, and even an old telly.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

A remote island holds what claims to be Scotland's smallest cinema.

New York City's smallest piece of private property.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

One English town's celebratory landmark spurred more trouble than anticipated.

The system of air guns are fired off remotely to scare any trespassing avians.

Right next to departures—how convenient!

The "Skinny House" is made from scrap, salvage, and a neighbor’s kindness.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

A World War II-era submarine is stuck in the mud in New Jersey.

This crumbling little graveyard was saved from the undergrowth by concerned veterans.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

Astonishing collection of helmets, scientific instruments, and medical models.