Herbert Hoover's "Brown House" rural presidential retreat was a PR disaster amid the start of the Great Depression.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

This phone booth-sized municipal building has been a piece of police property for more than half a century.

Deadliest lake in the world suffocated over 1,746 people in one night.

Exact replica of the ancient monument, but much, much lighter.

A building so large that it has its own weather.

This small island was the first National Wildlife Refuge ever created in the United States.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

One of the best places to see wild Colonial Spanish Mustangs in the United States.

The taxidermy remains of the most popular pony in children's literature.

The land is home to swimming ponies and a legendary 18th-century treasure.

This old-fashioned carhop restaurant gave the world the waffle cone.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

A museum in the heart of Virginia peanut country devoted to the humble goober.

Florida's first suspension bridge.

A vast array of tropical plants collected by a vacationing couple.

The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

Step back in time on this preserved 1800s farm.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.