A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

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 gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

Mine your own precious stones.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Avoid gangster interaction while window-shopping.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

A 12th-century fortress containing some of Berlin's oldest buildings.

This "floating railway" is one of the world's oldest monorail systems.

Giant, friendly pelicans in Central London, the most unlikely of places.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

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

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.