These imposing walls and towers look more like the ruins of a fortress than a monastery.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

One of Ireland's most infamous prisons for rebels including men, women and children.

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

A toxic ghost town sitting atop a massive coal fire.

Stairs often replace streets on the steep slopes of this old mining town.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

The menacing creature had a tremendous influence on the local culture before being exposed as a hoax.

A mysterious light in the wood, rumoured to be the the ghost of a railroad brakeman.

A restaurant and lodge in northern Wisconsin which served as a clandestine hideout for John Dillinger and featured one of the most famous botched FBI raids in history.

A towering Art Deco movie palace made to look like a Mayan temple.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

The oldest house in Chicago certainly doesn't look the part and there are some who say it doesn't deserve its title either.

A science teacher's dream.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

An antiquated German apothecary on Chicago's North Side.

Hot Doug's "Hot Dog" Stand.

Huge abstract sculptures of the Puerto Rican Flag.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

One of Chicago's last seafood smokehouses perfects a dying breed of fishcraft.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.