Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

Ancient Bronze Age rampart that was used into the middle ages.

An exquisite Baroque church in Vienna's old town.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Dine amidst exotic plants at this former royal greenhouse.

An ornate private entrance to the Vienna subway built specifically for the emperor.

The topiary maze at the Habsburg hunting lodge.

Baroque celebration of the end of the Great Plague of Vienna.

A glimpse into the festive and private lives of medieval Europe.

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

A silly medieval mural preserved on the side of a Viennese house.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The house that took a plunge into the facade of a museum.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

The Habsburgs' royal collections of art and wonders.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

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

Oliver Cromwell once seized the land under this house, which included the ruins of a medieval abbey that the owner used to build his stately home.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A collection of housewares from recent Irish history adjoined by a tower from ancient Irish history.

Huge standing stones mark a site of megalithic mystery.