This tribute to the fictional detective stands at the famous literary character's address.

Eighty million natural history specimens call this gargantuan museum home.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

A grotto replicating one of the world's most famed Marian apparitions sits across the ocean from the original.

A toxic lake near a volcanic caldera that is home to flamingos and other life.

An ancient forest of the Paleocene Age turned to stone.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A tower devoted to — and modeled after — the Divine Comedy.

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

Eat the ultimate iteration of Portugal's most beloved pastry.

First founded in 1472, this is the oldest bank in the world. Its history may explain why we call financial institutions "banks."

This medieval castle was reconstructed by Carlo Scarpa.

These elaborate gothic monuments honor Verona's medieval lords.

Not far from the more famous House of Juliet, visitors will find the supposed residence of her lover.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The secret medieval communication system will whisk your words above the noise of the crowd.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Pilgrimage site for star-crossed lovers.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Go inside to really appreciate this 500-year-old technological masterpiece.