With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

Abraham Lincoln's likeness rests at the top of this giant totem pole.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

This 19th century machine put animals (including humans) in boxes to study how they metabolized calories.

No one knows who painted this mysterious mural in a Penn State basement.

California's oldest wind harp represents a historic piece of America's Danish history.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

A mysterious stone embedded at the base of a historic Boston building.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

20,000 pieces in a Frank Gehry-designed building.

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

What is it about mushrooms that makes people wish they lived inside of them?

Mussolini gave Cincinnati a bronze statue of Romulus and Remus suckling at a wolf's teats.

An art deco ice cream shop covered in vintage train station tiles.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

Where the alchemists dream of transmuting base metal into gold was actually achieved.

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

The Laureates here get something even more coveted than a Nobel Prize: free parking for life.