Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

The angel of death appears to weep black tears at this grave marker.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

The home of the Dead Sea Scrolls is an abstract modernist dream.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

One of the largest underground systems runs under Canada's largest urban center.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Breathtaking and huge 430 year old maps of Italy.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.