This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

This monument pays tribute to the city’s contribution to basketball history.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

The ruins of a monastery that dates to the 7th century.

A moody and picturesque riverside ruin overgrown with vegetation.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.