Hamburgers are intensely proud of their tunnel beneath the river.

An abandoned Byzantine fortress and notorious prison.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

This huge limestone slab is considered the largest paving stone in Belgium and a relic of the earliest modern paving in Brussels.

The European Union’s tallest freestanding structure provides radio and television broadcasting to half of Latvia.

Gustave Eiffel's masterpiece until the Eiffel Tower was built.

A cobbled and kaleidoscopic street tucked amid Edinburgh's Gothic Old Town.

The monster at the center of the Darwin Center Spirit Collection.

Repository for more than 22 million pickled specimens.

The beloved beast's taxidermy remains sit in the Natural History Museum's cafe.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

Eighty million natural history specimens call this gargantuan museum home.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A naturally mummified 2,000-year-old man.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

The anatomical-pathological collection of a man who changed surgery.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

Spectacular secluded inlet with clear waters flanked by limestone cliffs.

One of Malta’s most popular beaches features a seemingly out-of-place statue of the Virgin Mary and baby Jesus.

This 19th-century aqueduct provides insights into how water was supplied to Victoria on the island of Gozo before modern plumbing.

The bones of prehistoric animals and early signs of human habitation have been found inside Malta's "cave of darkness."

This church is named for one of the most dramatic tales in the early Christian church.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."