A field of nothing but boulders which resembles a giant's gravel driveway.

This precariously perched fortress was once ruled by a crow-worshipping baron.

An abandoned coal mine reached by a steep hike.

One of the most spectacular 18th-century bridges in Scotland.

This outdoor observatory offers stellar views and a scale model of our solar system.

These two strange cones are actually a system of old nautical navigation beacons.

For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

Is it an island or a volcano? That question probably explains why it's uninhabited.

A semi-abandoned replica of Prince Edward Island's Avonlea—in Japan.

Thanks to this small string of islands World War II still hasn't officially ended between Russia and Japan.

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

In one of the world's smallest countries, a royal's personal winery is open to the public.

Enter the cabin of a life-sized Hindenburg replica.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

A gazebo that inspired the fifth episode of the "Twilight Zone" still stands in the creator's hometown

An Iron Age hillfort rooted in Arthurian legend was made famous by musician Peter Gabriel.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

An enormous, inside-out glass globe built in 1935.

Scotland still bears an enormous scar of its Roman past.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.