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

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

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The legacy of an unsolved, gruesome murder rests beneath the spans of this historic bridge.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

A place to eat for on-the-run agents and espionage enthusiasts.

Giant six-pack could provide one person a six-pack a day for 3,351 years.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

These pretty kitties killed and ate as many as 135 railway workers.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

World's second largest particle accelerator, where nature reveals its secrets.

This historic Illinois "Muffler Man" has been converted from axe-touting lumberjack to rocket-wielding space ace.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

This tiny historic jail along Route 66 is the perfect fit for exactly one criminal and their partner-in-crime.