The oldest bridge in South Carolina may have been designed by the same man who created the Washington Monument.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

An unfinished rail tunnel that has since been used to house cheese and bats.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

The world's longest covered bridge is a quaint and incredible wooden tunnel.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A brightly colored natural bridge formed by mineral-rich hot springs high up in the Andes.

A charming Spanish village sits atop this natural limestone overpass.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

A beautiful footbridge with over 2,000 glass sculptures along the walls and ceiling.

This natural sea arch highlights Ireland's rugged coastal beauty.

Claude Monet immortalized this medieval bridge in two of his paintings.

This bridge was constructed from the remains of the first Ferris wheel.

Where one of the worst train disasters in the country took place, leading to upgrades in rail safety.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

A railroad lift bridge that was only lifted once and became obsolete before construction was finished.

This restored house built from a Sears kit in the 1930s is a physical remnant of FDR's New Deal following the Great Depression.

The bridge continues the legacy of President Franklin D. Roosevelt's New Deal policy.

A surprising collection of bronze faces beneath a bridge in Loveland.

Art Deco stylings conceal the true nature of this bridge.

A unique bridge with an equally unique view.

The longest covered bridge in Delaware.