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

Megachurch turned Catholic church comprised of 10,000 glass panes.

This enormous World War II relic is one of the largest wooden structures in the world.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

Community bookshelf of 25-foot-tall book spines.

A unique botanical garden housed in three giant geodesic domes.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

Statue dedicated to the star of an old television show.

This striking art museum holds an amazing series of curiosity cabinets.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

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

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A beautiful but toxic fountain of mercury.

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