These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A submerged archeological park still holds the wonders of a Roman Sodom.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

An abandoned church gets a second life as a massive beer hall and event space.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

Ship skeletons haunt Baltimore's waterways.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A museum dedicated to exhibiting remarkable outsider art.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

The trials and tribulations of marking Poe's grave.

The site of the climactic scene from the classic horror film is now a historic landmark.

This industrial museum is based on one of the oldest standing iron forges in the U.K.

A repurposed railway tunnel with otherworldly acoustic characteristics.

This Gothic castle-like portal is a testament to the amazing craftsmanship of the navvies who built the railway tunnel.

A tiny chapel perched along a 14th-century bridge.

The bizarre headgear looks like it was made for a fool, not a king.

A hip bar decorated with walls of golden skulls.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

New York's oldest magic store.

Try not to get slimed in Tribeca.