This 6th-century church honors St. Tudno, the patron saint of Llandudno.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

This millstone commemorates a gruesome tale that may have been the source of the city's name.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

This park is home to a collection of important industrial and religious sites.

This tower is all that remains of a once-famed chapel.

Also known as "Leicester's Folly," this almost cathedral was left unfinished and in ruins.

A little-known castle set in a nature reserve.

A holy well believed to have healing powers.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

This ancient abbey now lies in majestic ruin behind a caravan park.

These precariously placed ruins harken back to a 13th-century castle.

This mysterious wheel-cross is the tallest in Britain.

Named for its similarity to the tip of a violin's bow, this striking formation was created by millions of years of erosion.

Unusually, this ancient Iron Age broch has never been excavated.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

Giant, friendly pelicans in Central London, the most unlikely of places.

The history of those incarcerated in Singapore during World War II is etched into the bricks of a popular staircase.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This curious, round temple is the oldest still-standing marble building in Rome.