The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

A stately palace has been converted into the world's largest cannabis museum.

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

This cemetery features modernist statues as strange as its name.

Single runway interrupted by a busy road that cuts across its middle.

A natural wonder in south Denmark.

This chimerical bridge/tunnel appears to dead end right into the sea.

World's strongest whirlpool.

The prototype for all Nazi concentration camps.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

A narrow strip of land is home to the tallest migrating dunes in Europe.

These crumbling Latvian forts make for some haunting seaside ruins.

This impressively complicated radioastronomy research center was once a tool of Soviet spies.

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

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

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

No matter how many times this community-run sauna gets destroyed, it always rises from the ashes.

In the waters outside Helsinki, a tiny island once used as a military outpost now welcomes visitors.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

This church also serves as a lighthouse complete with a beacon.

Villas that once served as playgrounds for the rich now fall away in decay.

Collection of nearly 500 concrete figures sculpted by the late Veijo Rönkkönen.

These Finnish rapids have been attracting tourists for over a hundred years and are now released with the push of a button.