Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

This impressive tunnel was dug entirely by hand over the course of 36 years.

One of the most unusual geological features, recognizable from a dozen hit movies.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

Quite simply the largest tree in the world (by volume).

The first bridge observation tower in the U.S. offers one of the best views of Maine.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

100 massive sculptures in the Hudson River Valley.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

Slyly buy a shake in the Parker Meridien lobby.

Read a book next to a Midtown waterfall.

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

A subterranean house of worship carved right out of the bedrock.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

Home to three historic ships from the age of Vikings.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Daily jousts and dancing barrel makers in Munich's mechanical clock.