Bell tower juts out from a village buried under a lake.

A graveyard of bathyspheres and diving bells paints a weirdly accurate account of ocean exploration's rickety history.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

The remains of a 13th-century stronghold built by the Welsh prince known as Llywelyn the Last.

Gladiators once walked this ancient, subterranean passage.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

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.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

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

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

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

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The metal frame is all that's left of a wicker sculpture which once towered over the M5 motorway.

Centuries of human activity have forged an eerie landscape of ruins and craters on an exposed and windswept hilltop.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

You can enjoy a (possibly haunted) stay at the medieval Norman castle that was once a favorite hunting lodge of King John.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.