The second largest surviving chained library is housed in this 12th century church.

A gorgeous medieval library where the books are kept in chains.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

The stunning interior of this Gothic church is covered in ornate gold details.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Naturally preserved bodies are eerily staged throughout the crypt in varying poses.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

A domed disco abandoned since the '70s now attracts artists and explorers under its unique roof.

Forgotten under the construction of a new urban roadway is a small, abandoned part of town.

Petrified footprints of one of the very first vertebrates to walk on land.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

A naturally beautiful, seemingly bottomless deep blue spring.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A medieval military street hidden beneath a charming French fishing village.

A rare wooden coffin set vertically into the Gothic arch of an ruined church.