A moody and picturesque riverside ruin overgrown with vegetation.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

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

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

A preserved block of timber buildings from the city's industrial era in the Middle Ages.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

At this cozy bar tucked down a hidden Galway backroad, Guinness makes the Gaelic come out.

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

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

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

Step into Narnia at this small park featuring statues from "The Lion, the Witch, and the Wardrobe."

The last Victorian market in Belfast.

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

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

Fantastic stainless steel dragon gates complete with mesh wings.

This supermarket offers shoppers a window into the past alongside their groceries.

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.