Eat the ultimate iteration of Portugal's most beloved pastry.

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

A market built atop boats is one of the few floating holiday markets in Europe.

Art Nouveau painter Alphonse Mucha spent 18 years creating these monumental paintings of Slavic history and mythology.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

A spiritual vortex among the red rocks in Sedona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The largest earthwork effigy in the world.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The reconstruction of this prominent building fulfilled a long-written command.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

Lumps of significant stone from around the world surround a flaming monument for peace.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

The largest 19th century panorama in the world still in-situ.

A miniature city, once ruled by the Queen of the Netherlands.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

A beautifully eclectic mix of architectural styles.