A hidden tunnel of bones in one of Malta's oldest churches.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

The Jesus tree of Malta bears a striking resemblance to Christ on the cross.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

This subterranean necropolis holds three floors of antler-dug grave caves.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

Stone pillars and a petrified wedding party in the hills of North Macedonia.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

An exhibit dedicated to a Lithuanian partisan.

A WWII museum that tries to reenact history.

This lonely Lithuanian chapel looks more beautiful and haunting in decline than it ever did in life.

Underwater roads undetectable from the surface used for escape routes from foreign invaders.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

Folky pharmaceuticals abound in this medicinal reliquary.

A tiny traditional village keeps an ancient method of beekeeping alive.

A small monument in Lithuania marks the geographic center of Europe—or at least one of the claimants.