A tiny chapel clings to a precipice above Germany’s gemstone capital.

A hidden "place of interment for gentlemen."

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

A natural wonder in south Denmark.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

The longest hedge maze in the world.

Surreal riveted sea forts once protected the Kent shores from German attack.

The sign at the garden gate reads: "These Plants Can Kill."

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.