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

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

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

These clocks tell time in a theological sense.

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

Follow the steps, and this roadside artwork will teach you how to dance.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

A bizarre roadside attraction and the first instance of miniature golf in the world.

A miniature city built by a single hunchbacked monk.

One person’s lost luggage is another person’s treasure.

Once a bustling cotton factory, this early 20th-century building is now home to a thriving artspace.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

This massive cave is a sight to behold.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.