Neo-Romanesque Architecture of Madrid: Crypt of the Almudena Cathedral

Cripta de la Catedral de la Almudena

The Crypt of the Almudena Cathedral (Spanish: Crypta de la Catedral de la Almudena) is a Roman Catholic church with a Latin cross plan situated under the main cathedral in Madrid, Spain.

Aquaria in Spain: Barcelona Aquarium

El Aquarium de Barcelona

The Barcelona Aquarium (Spanish: L'Aquàrium de Barcelona) is the largest Mediterranean-themed aquarium in the world located in Barcelona, Spain.

Historical Heritage of Naples: Napoli Sotterranea

Napoli Sotterranea

The Naples Underground (Italian: Napoli Sotterranea) is a labyrinth of ancient aqueducts, passages and cisterns hidden 40 m (131 ft) below the Historic Center of Naples, southern Italy.