At high tide this strange footbridge appears to have no purpose whatsoever.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

One man's vision and a labor of love of many.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A reproduction of earth's many biomes.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

A hillbilly theme park that proved so unpopular the land wouldn't even sell on eBay after it closed.

A marvel of Byzantine engineering under the streets of Istanbul.

An urban laboratory.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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

Advice-columnist's bell tower, paid for with pennies.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

The culprit who accidentally lit this 3,500-year-old tree on fire stated "I can't believe I burned down a tree older than Jesus."

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Impossibly life-like natural history models created out of glass by a father and son.