Relics from an era long gone, sit idle outside this Estonian museum.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

This striking structure is the Socialist-modernist centerpiece of a former Soviet spa resort.

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

Mysterious heaps of stones dot these otherworldly woods.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

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

This haunting sculpture was created as a statement on the mechanized warfare of the First World War.

These abandoned vessels are destined to be reclaimed by the forest.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

Nicknamed Kazakhstan's Grand Canyon, this natural wonder lies east of Almaty near the Chinese border.

The lovely lake that was naturally dammed, then naturally destroyed, then unnaturally saved.

World's oldest and largest space launch facility, once a secret missile testing site.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

Former island in the Aral Sea used to be a top-secret Russian bio-weapons facility.

An abandoned Soviet-era mining town in the mountains of South Kazakhstan.

Rusting ships sit in a desert where a sea used to be.

Perched above the bustling town of Kerak is a sprawling, ruinous castle that has witnessed nearly a millennia of Levantine history.