Proof of ancient aliens, or simply a creative way for farm laborers to clear their fields?

These clocks tell time in a theological sense.

Both Catholic and Protestant graves dot this 17th-century burial ground.

Valletta’s outdoor theatre stands within the ruins of a 19th-century opera house.

This sprawling, Brutalist estate feels like a city within a city.

This medieval village clings to a cliff in southwestern France.

The residence of a Taiwanese literary scholar sits down an alleyway adorned with depictions of snails.

The eyes and ears of this tower keep watch over Malta’s Grand Harbor.

An ancient Roman relief beautifully preserved on the façade of a house.

Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.

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

The twice-stolen hand of an alleged card cheat, with its final set of playing cards.

Dive into an undersea optical illusion off the coast of Mauritius.

Piran’s oldest square is laden with history and a beautiful 18th-century reservoir.

The niches over the western entrance of Westminster Abbey honor individuals from the 20th century who gave their lives for their Christian beliefs.

How did a fuel storage container become one of the most famous sights in the sporting world of cricket?

London’s first road overpass is so old that it was originally built for horse-drawn carriages.

So opulent and massive it was once dubbed a palace, this hotel's doors closed temporarily in 2007 and failed to reopen.

A monument to the “other Joan” who bravely defended the town of Beauvais with an axe in hand.

Climb inside an iron crystal magnified 165 billion times its normal size.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

This statue of one of the engineers who created the London Underground hides a ventilation shaft for the tube lines that run under the street.

For over two centuries, this palace served as a residence for the Holy Roman Inquisition's leaders, a courthouse, and a prison.

For a few short weeks in spring, this hiking path becomes a daffodil paradise.