This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

Believed to hold the remains of Japan's most infamous fox spirit, this stone is said to kill those who dare approach.

A disconnected rotary phone for "calling" lost loved ones offered a unique way of dealing with grief in disaster-stricken Japan.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

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

Train cars and railroad artifacts abound at this restaurant devoted to railway history.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

The longest and steepest staircase locks in the United Kingdom.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.

This restaurant proudly displays bread signed by the 39th president.

The unusual patterns in this rock formation result from two distinct modes of weathering.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

The original "capsule building" is a masterpiece of Metabolist architecture.