For one day every month Barcelona's Estació de França transforms into a market for model trains.

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

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

This aging storage facility is the world's largest brick warehouse.

Much of what constituted mid-century Liverpool now litters a beach outside of town.

Pyramid shaped monument with a tall tale attached.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

The Liverpool street made famous by the Beatles is real.

This natural gas vent certainly earns its name as the smallest volcano in Italy.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

Largest necropolis in the Mediterranean.

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

Romans built the world's tallest artificial waterfall in 271 BC.

Naturally preserved bodies are eerily staged throughout the crypt in varying poses.

The giant skeleton sculpture is surprisingly well-traveled.

This 16th-century monastery has been turned into a surrealist architecture compound.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

Geothermal waterfalls in Tuscany.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.