St. Augustine's record-setting narrow street was designed to protect against pirates.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

The grave of Mary Nasson is shrouded by witchy legends.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

The once-abandoned 140-year-old hotel used in the movie "In Dreams."

Made of bronze and wearing a blue gown, this lady sat in the same location in the Yantic Cemetery for more than 119 years.

This opera house along the banks of the Connecticut River has two Tony Awards to its credit but it’s never staged a single opera.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

The mysterious headstone of an unidentified bank robber was seen visited, every year, by a woman in black.

This museum holds a fully-functional replica of the "Turtle," the first American submarine ever built.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

The kind of mixed-up place that drives archaeologists crazy.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Erosion and time have created a naturally-formed water park.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Giant granite rocks standing end-to-end like a train of circus elephants.

Where the author wrote her beloved "Little House" books.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

Kentucky's anomalous peninsula projecting into the Mississippi River, site of legendary earthquakes and local feuds.

Life-size figures portray depot attendants, train crew, and passengers frozen in time at the oldest railroad station in Arkansas.