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

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Single runway interrupted by a busy road that cuts across its middle.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

Wall after wall of this French seaside neighborhood is intricately decorated with seashells and corals.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A tiny church on a man-made island in the Adriatic.

An ancient knight and a symbol of the city's freedom.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

France's high-tech, future-themed amusement park.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

The world's oldest bookshop still in operation.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.