Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Largest lake in Great Britain measured by surface area.

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

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

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

A grassy pyramid named after a French battle.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

This historic Boston building has gone from personal estate to porn theater and back again.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

Historic Hull Street was actually the first street with a proper name in the Boston area.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Spain's largest bullring offers a unique glimpse at architecture and history.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

The house where the writer spent his formative years.

The ruins of a medieval monastery named after a type of tree.

A stunning Victorian abbey and walled garden on a lakefront.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A hugely vast Irish landscape of barren rock that stretches for miles.