A student driver's nightmare.

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

This skewed English house has looked like it's going to fall over for centuries.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

One of England's most famous churches hides a pair of little known architectural treasures.

An avant-garde artist is survived by his seaside garden.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

Grotto replete with mystical designs laid out in glued shell mosaics.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

A house of bones — but nobody is quite sure to whom they belong.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Outsider art meets paleontology at this roadside reptile repository.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

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 massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The place where World War I began.

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

Place with alleged mystical powers in Old Orthodox Church in Sarajevo.

Oriental bazaar in the heart of Sarajevo.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A misnamed well, with a deep dark past.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A pair of connected skyscrapers form this symbolic gateway.