Every September, international competitors flock to a tiny Scottish island's flooded quarries.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

A close look reveals that the Scottish monument is just slightly off-kilter.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

This small chapel is built of human bones and decorated with a golden skeleton.

A garden in Lisbon filled with giant porcelain creatures.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The world's oldest bookshop still in operation.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The remains of the concrete ship can be seen during low tide.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

An abandoned World War II tank left to rust in the downland.

A vintage penny arcade hidden in the back of a fun fair-themed bar.

Gothic tower where Lord Alfred Tennyson wrote the poem "The Sleeping Beauty."