Couple's personal collection of pinball machines turned public pinball museum.

This series of Scottish caves has no clear purpose other than baffling historians.

A clear blue swimming hole with hidden caves, still unexplored.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

See massive fossils that are over 200 million years old in northeastern Arizona.

Surreal riveted sea forts once protected the Kent shores from German attack.

Visible below the waves are memorials to the city's Gold Rush dead.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

A fiery crater has been burning in the Karakum Desert since 1971.

Northern Ireland's Brobdingnagian stepping stones.

A church of bones, decorated with 40,000 human skeletons.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

A "simple-hearted artist" turned an isolated Icelandic valley into his own art museum.

The bright red stripes streaking across the rocks are the star feature at this Icelandic waterfall.

A charmingly eccentric magma chaser presents his complete history of the island's eruptions since 1947, in cinematic form, just for you.

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

This beautiful, historic church looks like something out of a simpler past.

This black church sits alone among a field of lava rock.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

A sulfuric martian landscape that looks far better than it smells.

A 19th-century horse lover's bequest led to the construction of this unique fountain in Chicago.

A one-armed veteran of the Battle of Waterloo lies in a cemetery for one in the middle of a Chicago scrapyard.