This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

An ancient knight and a symbol of the city's freedom.

This dramatic rail curve was once the target of a failed Nazi attack.

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

If you want to get married in the White Marble City of Ashgabat, you should do it in this surreal disco ball building.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

This massive blockhead sculpture hides an entire library.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

Beatlemania is still going strong... at least in Kazakhstan.

Time capsule of a museum, in which the Soviet Union remains alive and kicking.

Light still pours into the ruins of this ancient Islamic observatory.

18m long sarcophagus of a constantly growing dead prophet.

Red frames showcase remnants of one of New York's original subway stations.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

Swedish skyscraper with a 90° twist.