A labyrinthine underworld of tunnels and caverns hides beneath the city.

On Japan's Tashirojima Island, cats are king.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An automaton perched above an classic clock and watch store

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

Public clocks around the city chime with bullfights, cockfights, old railways, and other local traditions.

This ornate church designed by a self-taught architect is an eclectic masterpiece in the heart of Central Mexico.

A historic cemetery doubles as a museum containing hundreds of unique tombs sculpted by a single artist.

From Nunavut to Tierra del Fuego, you won't find any lighthouse higher than this one.

This gorgeous stretch of coastline is home to beautiful views and centuries-old rock art.

This botanical garden boasts sculptures, industrial ruins, and an endorsement from the Dalai Lama.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Two waterfalls flow down the cliff faces decorated with rare natural basalt columns.

This semi-secret storybook hedge maze is also the oldest garden in the city.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

Venice's "Island of the Mad."

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This old village lock-up is known as the "round house," but it is actually octagonal.

The storied English village that pretended to be insane inspired NYC's nickname and the fictional namesake in the DC Comics universe.