The king of U.S. high points towers over every other peak on the continent.

The only arched bridge made of stone on the entire Mississippi River.

Hub of Scandinavian culture in a Minneapolis deli.

When flour explodes, it's not a pretty sight.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

America's most famous piece of self-built architecture.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

One of the world's tallest statues is also one of its most hated.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

Former headquarters of the KGB.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The Guardian of Tallinn.

An alien church provides much needed silence in the midst of a Finland shopping center.

A subterranean house of worship carved right out of the bedrock.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

An underground city of salt.

Monumental sculptures guard many of the graves, transforming this necropolis into an open-air fine art museum.