This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

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

The only thing sweeter than the potatoes is the canine proprietor of this roadside stall.

An acoustic anomaly with a mysterious cause.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Natural time capsule containing an alien ecosystem.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

The final resting place of New Orleans' most famous voodoo priestess.

This castle resides in a valley known for immense bloodshed during the Middle Ages.

It took over 100 years to decode this enigmatic epitaph for two buried brides.

This memorial pyramid marker honors one of the United States Government's first official camel riders.

A scrap-metal sculpture recalls an infamous 19th-century camel.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

This former ice house dates to the early 19th-century and featured an underground chamber.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

A flight of this "ghost staircase" has 40 steps on the way up, but only 39 steps on the way down.

Run by members of the Tohono O'odham Nation, this community farm nurtures traditional desert cultivars.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

The eccentric mansion of one the most popular horror authors of modern times.