For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

Celebrated in poem, this tiny hidden cemetery has a big and grisly history.

A small plaque highlights the damage caused by German air raids during World War II.

This hidden museum examines the complex history of the country's law enforcement.

A palatial former bank building now houses what may be the poshest art venue (and former Tesco) in Belfast.

The statue honors a beloved bird that once roamed St. George's Market.

An Irish cemetery filled with victims of political strife and violent conflict, including the grave of Bobby Sands.

The last Victorian market in Belfast.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

The whiskey producer's archives includes a historical list of infractions committed by and associated penalties exacted upon employees.

This Irish museum in a historic 19th century market pays tribute to the glory of butter.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

Museum dedicated to the UK's first charity for abandoned children, with keepsakes of the mothers who left them behind.

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

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

A museum wholly devoted to juvenescence.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

This overlooked street light once served as a KGB dead letter box.

There's an exclusive Beefeaters pub hidden in the Tower of London.

These morbid carvings remind churchgoers of the inevitability of death.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.