This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

Only a fragment of this 15th-century Dance of Death survives today.

The oldest continuously operating pharmacy in Europe.

A medieval setting reimagined into a unique art alley.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

A massive playground in the woods of Germany.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

The Guardian of Tallinn.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

This ruined travelers shelter sits abandoned in a desolate bog of Flow Country.

An abandoned village where the ruined foundations cling to a cliff.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

This rare surviving broch is one of Scotland's most impressive Bronze Age structures.

Where the sleeping monsters of Scotland's oil industry are left to rust.

An underground city of salt.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This historic electric train has operated with regularity since the early 1900s.

Legendary site where an evil bishop was devoured by rodents.

Tiny castle in the middle of the Rhine made you pay to pass.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Twisted buildings adorn the banks of the Rhine river.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

This "floating railway" is one of the world's oldest monorail systems.

This painted Lego bridge is the product of over a century of locomotive history.