Its interior is adorned with some of the best examples of early Christian mosaics.

This giant sculpture made of trash is a critique of society's wastefulness.

Ancient catacombs form the foundation for this Rococo orgy of a church.

A small but charming botanical garden that contains many exotic plant species.

Building owners can take out tiles for free at this repository for historic building materials.

A reservation-only highland forest reserve of endangered Pinsapar firs stands above a village in Andalucía.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

This amended headstone marks the grave of a participant in one of the most successful military deceptions of all time.

This remote location of this Moorish stronghold means it doesn’t attract many tourists—and that it still has the aura of fear and bravery of the 1300s.

Moorish signal station on a stratgic rocky outcrop.

A complimentary beverage is offered to the bodega's resident rodents every day.

The cathedral of a controversial, conservative, schismatic sect that declared the Catholic Church heretical and founded its own succession of popes.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

An open-air "garden" of mural art that changes weekly.

A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

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

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

A unique music museum housed in a historic Boston theater.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.