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

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

A tribute to all the green-thumbed workers who tend London’s public parks and gardens.

Henry VIII's forgotten castle was built by the gunpowder-obsessed king to be defended solely by cannons.

Also known as Rye Castle, this 13th-century fortification later became a prison and held one of Rye's most famous criminals.

An ancient water supply dating back almost 500 years can still be found standing in East Sussex.

Two gilded cherubs perched on a church bell tower have been reminding visitors of the finitude of life since 1760.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

A quiet memorial to those who died saving others in the heart of the City of London.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

Dictionary Johnson’s favorite feline.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

The only monument to name all of the passengers and crew who died on the RMS Titanic.

The last Victorian market in Belfast.

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

A museum marks and documents the site of the Titanic's launch.

These engineering masterpieces are a dominant feature of the Belfast skyline.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

The atmospheric road was never meant to be so creepy.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

Northern Ireland's Brobdingnagian stepping stones.

The lake that fills and empties itself at random.