A stunning Victorian abbey and walled garden on a lakefront.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

A moody and picturesque riverside ruin overgrown with vegetation.

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

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

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

This urban oasis is a marvelous meld of music and landscape architecture.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

A huge enchanting public park just outside the ancient walls of Rome.

An abandoned Roman salami factory has found new life as an art space home to 200 squatters.

A hospital where antique dolls are given new life.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Architectural monsters are devouring this palace's every door and window.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

An alchemist's "magic door" stands in the middle of a Roman park.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The middle finger of modernity.

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.