Hidden within Sydney’s lush Royal Botanic Garden is a walled cactus rockery and the site of Australia's first zoo.

This letter written by Queen Elizabeth II in 1986 won't be opened until 2085.

Centuries of human activity have forged an eerie landscape of ruins and craters on an exposed and windswept hilltop.

The remains of one of Wales’ great medieval buildings, with a pub in the cellar.

A letterbox installed specifically for the first editor of the Oxford English Dictionary.

Where the rules of that most quintessentially English game were first devised by an eccentric inventor.

Built over an abandoned train yard, this hidden gem is full of winding paths and offers gorgeous views of Sydney Harbour.

This home on a quiet suburban street is completely covered with vibrant mosaics.

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

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Hear the quietest sound from across the dome.

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

One part local history, 99 parts gruesome haunted house.

The luxurious English estate houses the world’s largest private collection of French Rothschild wines.

This slice of 1960s Danish modernism does not conform to the Oxford college stereotypes.

A busy island at the center of the world that doesn’t actually exist.

These docile dragons are ideal inhabitants for the conservatory greenhouses.

All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

The patch of land below the memorial was gifted by the British to the United States.

A 13th-century fortified manor house that was once sieged during the English Civil War.

Manchester's abandoned train depot lingers in a post-industrial purgatory.

The designer of this railway tunnel added a birthday present for himself.

The only medieval bridge in Britain with its defensive tower still in tact.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.