This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

Statue of death tucked in the University of Medicine courtyard.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

France's national museum of scientific and industrial instruments.

There's an exclusive Beefeaters pub hidden in the Tower of London.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

The Hanshin Expressway goes right through its 5th, 6th, and 7th floors.

One of these two land speed record-breaking vehicles went so fast it shattered the sound barrier.

This ruin in a suburban park may be the place where Shakespeare's "A Midsummer Night's Dream" was first performed.

Bill Murray bowled three straight strikes here at Reno's "Taj Mahal of Tenpins."

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

An overlooked monument to the celebrity gangster who helped put the sin in Sin City.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

One man's lifelong collection of 10,000 rare steins tells the story of beer drinking from 1350 to today.

The oldest still-inhabited hill fort in India looks like a magnificent golden sandcastle.

A creepy, deserted mock Arabian village can be found in the middle of the Qatari desert.

Burbling away in refrigerators are 105 sourdough starters from around the world.

This sprawling bookstore spans four floors and has more than a million books in stock.

A mesmerizing reservoir nestled at the heart of a pre-Islamic Yemeni village.

A dreamy mausoleum honors Persia's most famous poet.