Center filled with hands-on displays served as a tribute to several astronauts with connections to the state.

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

A hugely vast Irish landscape of barren rock that stretches for miles.

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

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

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

This World War II relic let Allied pilots know they were entering neutral airspace.

The last Victorian market in Belfast.

This massive monument has been telling the time for 150 years—at a slight angle.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

The oldest continuously operating pharmacy in Europe.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

A subterranean house of worship carved right out of the bedrock.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

An abstract monument to a symphonic composer.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

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.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

The best place for scenic views of the DMZ and North Korea.

Secret North Korean passage discovered below the world's most dangerous border.

The third-tallest statue in the world depicts the "Buddha of Infinite Light," complete with observation deck in his chest.

Remnants of an old bank adorn this station's brick wall.