The oldest residential street in Europe also features an optical illusion.

The ruined abbey includes a rare surviving example of a monastic latrine.

Remnants of the Nazis' occupation of Denmark linger along the sand.

Historic poems about the noble act of defecating have been preserved on the wall of this old convent.

The portrait of a man from Japan who sent weekly letters to a Dutch hotel he never visited.

High winds can make this one scary landing.

At high tide this strange footbridge appears to have no purpose whatsoever.

It is locally loved and ridiculed for literally looking like poop.

This abandoned stepwell is one of the largest, deepest, and certainly one of the creepiest in India.

A painfully obvious spy house sits right across the street from the Russian Embassy.

The 10-foot-wide Long Beach home was built on a dare.

An abandoned jewel of a ballroom on the top floor of Australia’s busiest rail station echoes with the sounds of a bygone era.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

Because sometimes the most efficient route from A to B isn't a straight line.

"Only the dead get off at Kymlinge."

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

The famous facade of Grand Central Terminal hides a regulation tennis court, and it's not the first one.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.