World's largest bell sits on the grounds of the Kremlin in Moscow.

Former headquarters of the KGB.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

1513 Turkish world map, full of European state secrets and snarky commentary.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

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.

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This unique building in the main square stands out among the city's typically Baroque architecture.

The Jesus tree of Malta bears a striking resemblance to Christ on the cross.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A more chill but no less fascinating version of the famous ancient archeological site.

A massive, heart-shaped, wind-carved crater in the middle of the Israeli desert.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

This subterranean funicular is one of the world's smallest subways.

An iconic view point of the Sea of Galilee offers a look into Israel's past.