One of seven Jewish catacombs in Rome and one of only two open to the public.

Two 2,500-year-old Phoenician boats found on the coast of Spain, giving incredible insight into the ancient maritime traders.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

Giant granite sculptures representing family on the northern coast of Spain.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

This ancient Spanish castle sits high upon a hilltop.

Moorish signal station on a stratgic rocky outcrop.

One of Europe's largest supercomputers is housed inside of a disused chapel.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

This semi-secret storybook hedge maze is also the oldest garden in the city.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Welcome to the world's only museum dedicated to the Ukranian Easter egg.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

A subterranean Holocaust refuge within one of the world's longest cave systems.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

A slice of central Asia in the middle of Berlin.

Minnesota's oldest and deepest mine is now an underground physics laboratory.