Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

This clock was gifted to Mexico as a show of gratitude for its long history of welcoming Arab migrants.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

The burial place of some of Mexico's most prominent residents is full of macabre stories and hidden masonic symbols.

CDMX's home for the world's culinary delights.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

This old-school café is famous for serving coffee, chilaquiles, and the Cuban Revolution.

Some charming, but sadly, unloved animal statues call this park home.

The museum houses "the most studied meteorite in history," among other geological oddities.

This ancient structure was built by a mysterious civilization that was largely destroyed by a volcanic eruption.

You can release a young butterfly at this beautiful indoor garden.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

When the rain falls, this drain system turns into a musical instrument.

An impressive monument to Poland's independence.

An abandoned football stadium with a tragic past.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

The medieval network of canals hidden underneath the city is opened to explorers each year.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

This strange statue features a bust of the famous composer plopped atop a woman's body.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

The beautiful, ornate weather station is the most popular geocache in Salzburg.