Orthodox church partially financed by Tsar Nicolas II.

World's largest Christmas store.

The park is home to the United States's only still-operating Dutch windmill.

The clothes-washing king doubles as a community center with some unusual features, including an aviary filled with finches.

This midcentury chapel is a bold architectural statement and a symbol of Indiana's Lutheran heritage.

A strange rock in Chicago marks the spot where a tree once stood in honor of the 18th President.

The remains of this ornate chapel now act as a portal to a cramped French cemetery.

One of only two commuter aerial tramways in the United States.

The largest of London's subterranean rivers and once a mad, bad center of London life.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The ritual has been performed uninterrupted for nearly 700 years.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

The Great Fire of London and the regulation of one-way streets both started in this alley.

The commemorative stone column conceals a secret laboratory.

This historic London residence was once the womb of Scientology.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

The taxidermied remains of a once-great parrot.

The Tudor-style cottage in the middle of the square is not quite what it seems.