The famous Alice Liddell designed this memorial after losing her sons in World War I.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

An ancient Roman relief beautifully preserved on the façade of a house.

Healing waters from a holy well, previously used by locals for doing laundry.

Statues of a fire-breather, a clown, and a whole performing troupe celebrate Luxembourg's creative side.

A German shoemaker-turned-folk-hero whose impersonation of a Prussian military officer earned international notoriety.

Some believe that the artist behind this whimsical statue inserted his own likeness as a way to discreetly flip the bird.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

This small chapel built into rock is the oldest place of worship in Luxembourg.

A former ironworks that was the first UNESCO industrial site.

These unassuming buildings in the tranquil churchyard of rural Warblington are in fact grave watchers’ huts.

A rare full-sized statue of one of Britain's famous writers.

This gravestone tells the tragic tale of its occupant's death.

This grave remembers the beloved canine companion of soldiers far from home.

These graves are a rare example of Napoleonic Prisoner of War Graves in Britain.

These public toilets were used as a dead drop by pro-Soviet spies to trade British military secrets during the Cold War.

An inverted staircase above the entrance to the Bethnal Green Underground Station functions as a memorial for people who lost their lives during the worst civilian disaster in the U.K. during World War II.

A relic of Victorian grandeur hides beneath a busy South London road.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Notorious artist squat renovated into legal studios.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The approximate spot where the last Grand Master of the Knights Templar was put to death.