The oldest natural aquarium in the United Kingdom.

This observatory within Europe's first dark sky park offers stunning views of the night sky.

Legend says this cave housed a 16th-century cannibal and his family of 48.

On a hill overlooking Loch Trool, a granite boulder marks the site where Robert the Bruce, King of Scotland, defeated an English army.

Near this coastal cave stands a small memorial to the hermit who made it his home for three decades.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

This sculpture depicting the history of Maryport turns into a light show at night.

One man and his dog, immortalized in a giant statue.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A 30-acre garden inspired by the principles of modern physics.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

The last king of Poland was interred in this church nearly 200 years after his death.

Ruins of a late 1950s Polish ski jump ramp in the middle of the city.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

Legend says a giant, venomous spider once dwelled within this Polish church.

This symbol of Polish heritage survived the occupation during World War II, hidden in plain sight.

Hundreds of notes give thanks to the patron saint of lost causes.

Gliwice Radio Tower, likely the tallest wooden structure in the world.

On this Polish road, an optical illusion makes cars seem to roll uphill.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

Brought to you by the makers of fiberglass dinosaurs.