Artfully arranged bones of 5,800 Austrians.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

The house that took a plunge into the facade of a museum.

A history of heat is on display at this unique Austrian museum.

This museum promotes informed contraception by documenting its often secret past.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

A modern, secular take on a traditional Virgin Mary motif.

This collection of 80 polarizing foods aims to challenge your subjective notions of repulsion.

Swedish skyscraper with a 90° twist.

Museum dedicated to wax representations of disfiguring diseases.

A historic observatory precariously perched at the "Top of Europe."

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Medieval irrigation channels built into the sides of mountains provided Valais with water for hundreds of years.

Ancient ruins hidden underneath a modern luxury hotel.

This sublime architectural marvel is a rare example of an expressionist church.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

Museum devoted to the artificial language of Esperanto.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.