Bridge that died in war and was resurected.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

This ancient Roman aqueduct once funneled water to Diocletian's palace.

An ancient knight and a symbol of the city's freedom.

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

Gargoyle head that brings good luck.

This water-powered cliffside railway is one of the steepest funiculars in the world.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

This tall stone wall with no door and ill-matched windows was built centuries ago, and used as a shelter for domesticated pigeons.

Legend has it that this stone moves down to the river sometimes to have a drink.

Estimated to be more than 5,000 years old, this yew may be Britain’s oldest.

The remains of a 13th-century stronghold built by the Welsh prince known as Llywelyn the Last.

A grand mansion in rural mid-Wales gifted to the Welsh people by two sisters.

In 1977, an eccentric book lover formed a micronation for book lovers.

The remains of one of Wales’ great medieval buildings, with a pub in the cellar.

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

A centuries-old forgotten underworld lies beneath Malta.

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

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

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

This subterranean necropolis holds three floors of antler-dug grave caves.

A vast Communist-era exhibition space in the Bulgarian capital.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.