This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

The place where World War I began.

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

What once sat in the world’s spotlight is today a largely disused ghost complex.

A massive Montreal stadium that has seen nothing but trouble since its inception.

During the holidays, a vintage subway train whisks New Yorkers back in time.

You thought Santa Claus didn't exist, but it turns out you were wrong.

This lab's maddening silence is good for business but bad for sanity.

A New Hampshire grave with a grudge.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

A memorial to the soldiers who died in the bloody battles to control Verdun in World War I.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

All that's left of the quintessential "cabin in the woods."

One man's unrequited love stands in a glass box forever.

A chessmaster's dream destination.

A cursed torii gate still stands on the edge of Haneda Airport, decades after its shrine's relocation.

This 15-foot tall obelisk commemorating the Philadelphia-Baltimore railroad connection sat neglected for over a century.

Alexander Hamilton’s creation caused quite a bit of controversy.