Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

A hidden three-foot-wide house separates these two regal churches.

Four-story concrete hotel never opened to customers.

The king of U.S. high points towers over every other peak on the continent.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

One of the largest trees of its kind in California.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

A surreal statue honoring Prague's favorite literary son.

This former coal gasification plant found a curious second life as a popular public park.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

This grand old 80-foot sequoia towers above the buildings in the city’s retail center.

In the absence of a Chinese-language newspaper, for years the community posted daily updates on this simple bulletin board.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

The embalmed remains of the communist leader lie within a custom crystal coffin.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.