A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Catacombs turned marketplace.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

This hidden green space is the city's second largest conservatory.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A Roman spa buried deep beneath the City of London.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

A restaurant devoted to "trouser grip" wrestling, an ancient form of Viking wrestling that is Iceland's national sport.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

A unique tribute to the millions of animals who served and died for the British military.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.