This statue honors the thousands of Allied avians that served and died for France during World War I.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

An astounding collection of taxidermy, fossils, skeletons, and even a few strange live beasts.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

An important example of architectural history slowly decays in the city center.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

Museum in a swimming pool where the water still flows.