This wildlife refuge is home to more than 200 species of birds, as well as monkeys, lizards, and other wildlife.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

The tragic tale of the dentist who pioneered the use of anesthesia.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

There's an exclusive Beefeaters pub hidden in the Tower of London.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

One of the last remaining buildings from one of Calgary's earliest businesses.

Learn about the last river many crossed to find freedom from slavery in the United States.

Metro station with a claim to rock n' roll fame.

A monument to the man who almost killed Hitler.

A forgotten graveyard lost in the tangles of an overgrown garden.

This hidden art nouveau gem was designed by an architect in search of a national style.

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

The television series' iconic giant foot was borrowed from this classical painting.

London's smallest police station is barely the size of a phone booth.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This artful dam holds back a crater-made reservoir that can be seen from space.

A World War II gun battery sits at the easternmost point of North America.

The remains of a paranoid inventor's hidden workshop lie in beautiful ruins amidst a Canadian park.