Go inside to really appreciate this 500-year-old technological masterpiece.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Pilgrimage site for star-crossed lovers.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Hear the quietest sound from across the dome.

This demon atop the Notre-Dame de Paris looks utterly bored.

The watery grave of an impractical idea.

A little-known memorial to servicemen and nurses killed in the line of duty during the First World War.

After the musical legend's death, his memorial was mysteriously graffitied in gold.

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

An old soap company building now houses one of Minneapolis’s oldest independent non-profit art galleries.

This old residential building was once the largest flour mill in the world.

The home where a lovestruck Fitzgerald wrote his first published novel, "This Side of Paradise."

The literary king of the Jazz Age was born in this lovely Minnesota home which still honors his legacy.

Each year, one talented artist puts on a show sculpting twelve butter-based busts of dairy princesses.

Opened in 1956, the first modern indoor shopping mall in the world was inspired by the shopping arcades found in European cities.

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

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This museum houses an imposing skeleton army comprised of creatures great and small.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

France's most famous cemetery, with some of its most curious tombs.

143 feet of leaping muskie whose mouth can be used as a wedding venue.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Eight "Guardians of Health" protect this art deco water tower from pollutants and bacteria.