Where the rules of that most quintessentially English game were first devised by an eccentric inventor.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

The oldest continuously operating pharmacy in Europe.

The Guardian of Tallinn.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

A subterranean house of worship carved right out of the bedrock.

This church also serves as a lighthouse complete with a beacon.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

The last surviving submarine from a strange chapter of Finnish history.

This castle tower in Wales leans at a steeper angle than the Leaning Tower of Pisa.

Where the people of Gozo have been doing laundry for more than six centuries.

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

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

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

These temples are among the oldest free-standing stone buildings in the world.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A series of haunting wooden totems are hidden in the woods surrounding a German environmental center.

The secret wartime bunker built on the platforms of an abandoned Tube station.

The wreck of a B-29 Superfortress now stands as a memorial left in the moors.

This is one of the very few intact windmills built by the Knights of St. John in the island nation of Malta.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

These clocks tell time in a theological sense.