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

A cluttered and astounding collection of antiquities and curiosities.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

270 million year-old forest of stone.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

Two cannon-like cranes were installed on top of the bank building to fend off bad feng shui.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Climb to the top of the world's largest seated bronze Buddha.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

A shrine built to combat the bad karma of a commercial venture.

A memorial that honors the victims of a tragedy in Ukraine.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

Home of the Large Hadron Collider and the birthplace of the World Wide Web.

Perhaps the most scandalous statue of America's first president.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Home to items never before seen by the public.

This museum remembers the tough Mormon trek across America through an intriguing array of artifacts.

Visitors to this library are in for a real-world education in modernist architecture.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

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

The first American department store, and home to the largest operating musical instrument in the world.