The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

Banksy's image of a naked man dangling from the window of a sex health clinic.

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

Hear the quietest sound from across the dome.

One part local history, 99 parts gruesome haunted house.

A hidden tunnel leads to a medieval queen's shrine buried beneath a parking lot.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

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

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

These barriers stand as stark reminders of Northern Ireland's troubled past.

Belfast's namesake river still winds below the city center, hidden from sight.

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

The atmospheric road was never meant to be so creepy.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Legend says the water within these mysterious sacred springs stays cold even when boiled.

The inscribed stone at Kilnasaggart is a remnant from nearly a millennium ago.

The Greek island's old British cemetery feels like a forgotten garden.

The ghost town where the villagers refuse to leave.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

Local legend says the remains of Father Christmas lie within the medieval grounds.