This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

Part of a highway network meant to connect Miami to Montreal, this 10-mile stretch of road made from red bricks is still around 100 years later.

Though these human-made islands were constructed as an escape for the wealthy, they rarely see many visitors.

A paradise hotel turned from opulent to overgrown.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

An Italian hillside ghost town.

Though an earthquake destroyed this village in 1980, one former resident still walks its streets every day.

An aluminum skeleton brings Chinese mythology to the French shore.

A huge maze complex and whimsical miniature village in Tasmania.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

A small part of Russia that does not touch any other part of Russia.

A vortex fountain that seems to rise out of the ground.

This medieval "painted village" is famous for its geometric facades.

The "Mona Lisa" of funerary art.

An isolated, rusty phone booth commemorates Iceland's first international telegraph cable.

A submerged archeological park still holds the wonders of a Roman Sodom.

For the last century, this international border within a small town has appeared and disappeared various times.

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

This museum of Viking vessels allows visitors to take a replica out for a spin.

This aquarium has almost as many world records as it does fish.

Inside this museum is an ongoing excavation of an ancient shipwreck.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

This hulking behemoth is actually five interconnected towers built in the 1960s.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.