High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

Legend says this sacred tree was a gift from goddess Athena.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

Monasteries on rock pillars, once accessible only by frayed ropes.

The hallucinogenic center of the ancient world.

One of the oldest family businesses in Reykjavík serves lamb-based hot dogs.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This stunning concert hall has become a symbol of Iceland's national recovery.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created with the discharge from a geothermal energy plant.

An abstract monument to a symphonic composer.

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

Sweden's "good old days" painstakingly re-created in a model village.

A former suicide bridge is now accumulating symbols of love instead of a body count.

It houses the remains of a 17th-century version of the Titanic.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

Nordic giants resurrected from the sea and restored to their former greatness.

Old Danish castle immortalized in Shakespeare's Hamlet.