A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Numerical symbolism abound at East Asia's oldest observatory.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

When ecosystems collide in the arid Southwest.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

A wall of chewing gum moonlights as collective art.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

A science teacher's dream.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

There aren't too many operational funiculars around, but Pittsburgh has two!

Famous church recognized for both its unique design and disciplined monks that live according to the Benedictine discipline.

Less a museum than a bizarre fantasy world created by artists and engineers.

Ancient pueblos built into the base of a natural canyon wall.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Home with Gothic windows featured in a famous painting.

Another in a long tradition of legends regarding infernal seats.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.