Thousands of letters to Santa get delivered to this mailbox in Greenland.

Greenland's first shopping mall also hosts the country's government.

1% of Greenland's entire population used to live in this single building, which is now slated for demolition.

These eight mummies are the best-preserved human remains ever discovered in North America.

One of the world's steepest streets seems to have houses sliding down it.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

The legendary statue-hating superintendent of Golden Gate Park is honored with... a statue.

California's most comprehensive horticultural library.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Elevated freight railway turned wildly successful urban park.

A monument celebrating the idea of reaching inaccessible places.

Home to items never before seen by the public.

At 207 feet, one of the world's longest continuous escalators.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The world's longest known cave system.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

Walk the whole Mississippi River!

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."