Instead of numerals, the unusual clock face spells out a memorial to a lost loved one.

A remarkable lava formation encloses a line of Buddhist statues that can't be accurately counted, according to local mythology.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Elevated freight railway turned wildly successful urban park.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

The tomb of history's greatest potato promoter is surrounded by tubers.

The narrowest street in Paris.

The first green space constructed on an elevated viaduct.

Indents in the pavement are all that remain from a grisly death machine in Paris.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The Last Home of an Executed King.

This lighthouse was crafted as penitence for the theft of wine bound for a monastery.

The now-quiet remains of coastal artillery defenses that were used in both World Wars.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

Visit the WWII bunker where the British won the battle for the skies.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

Built by George III to observe the transit of Venus, this Georgian gem is a unique survivor in the Arcadian landscape of Richmond upon Thames.

A kaleidoscopic warehouse-maze of handmade neon signs.