Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A beautifully eclectic mix of architectural styles.

The steepest classic funicular in the world glides along a dizzying incline.

Tourists to the mountaintop Sicilian town often overlook its ancient fortifications.

The world's most active stratovolcano is almost always erupting.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

Eighty million natural history specimens call this gargantuan museum home.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

Pilgrimage site for star-crossed lovers.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

The prototype for all Nazi concentration camps.

The fairy tale castle of the "fairy-tale king."

Five candy-colored villages on the Italian Riviera.

Breathtaking and huge 430 year old maps of Italy.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The final resting place of the great navigator, or maybe his brother.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

The first museum in the world devoted to sexual gadgetry.