This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

This medieval city gate is now a blend of the past and the modern world.

The Great Fire of London and the regulation of one-way streets both started in this alley.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

This hill and tower are steeped in legend, from King Arthur to the Holy Grail.

The former home of the world-famous Templeton Carpet Factory.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

This Funeral Hearse Museum represents the finest in cadaver transportation.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The building where Mary, Queen of Scots was said to have bathed in white wine.

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

An artistic interpretation of the history of a Scottish park, combining poetry with anthropomorphic animals.

One of the first monuments dedicated to the accomplishments of the great Vice Admiral, Horatio Nelson.

Inside this art museum resides one of Glasgow's most famous musical instruments.

This monument is dedicated to a young boy who survived a disaster that forced Edinburgh to reevaluate its building codes.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

A wonderful collection of fossilized dinosaurs and other creatures that roamed the landscape millions of years ago.

A charming Spanish village sits atop this natural limestone overpass.

This 12th century, partially destroyed, abbey has had several owners and was seized during the French Revolution.

On the shores of Lake Garda, the ruins of a Roman villa that allegedly belonged to the poet Catullus.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.