At almost 1,000 years old, this is the oldest known door in all of Britain.

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

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

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Charles Babbage's proto-computer, painstakingly brought to life.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This supermarket is suspended 25 feet above an interstate highway.

One of the last remaining movie theatres in the country that features a rear-projection system.

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

The longest staircase lock in Britain.

It's said this was once the home of King James V's pet lion.

This museum offers a glimpse into early 20th-century Glasgow life.

This painting of a beloved dog will be on display at the Scottish National Gallery at long as the museum exists.

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

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

The location of this historic castle was inspired by a donkey.

A six-ton wedding present for the King of the Scots.

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

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