A hidden three-foot-wide house separates these two regal churches.

A small but charming botanical garden that contains many exotic plant species.

Home of the Large Hadron Collider and the birthplace of the World Wide Web.

CERN's beautiful, bending sculpture is a tribute to the spread of knowledge.

This statue of a Hindu cosmic dancer at CERN is a metaphor for modern physics.

This stone in Lake Geneva was once the reference point used to determine altitude in Switzerland.

The most impressive of Basel's three remaining city gates.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

Art Nouveau beauty hidden deep in Cairo’s Al-Helmiya neighborhood.

Nobody knows what this saucer-like ancient Egyptian object was for.

The oldest Egyptian obelisk still standing in its original site.

Ozymandias’ time-keeping temple.

Northern Ireland's Brobdingnagian stepping stones.

These murals stand as reminders to the troubled history of this Northern Ireland city.

The Dublin sea wall draws walkers, photographers, and fishing enthusiasts.

Explore Dublin's laneways full of diverse street art and graffiti.

The ancient tomb acts as a calendar that keeps perfect time.

The remains of a 13th-century Norman fortress, largely destroyed by an explosive renovation.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

These Neolithic burial mounds and a still-intact passage tomb may have solar calendar significance on the spring and autumn equinoxes.

In this German city center, the streets have no names.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.