A mysterious castle built as a monument to lost love.

In memory of the 110 victims of ValuJet Flight 592 that crashed in the Everglades.

Former villa and estate of James Deering developed to preserve native tropical forests.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

Twenty-eight years after this local landmark was washed ashore by hurricane Hugo, it was washed away by hurricane Irma.

The final resting place of the Seminole Indian chief who fought against government occupation in Florida.

A quirky Poe-themed joint on an island keen to celebrate its overlooked connection to the famous writer.

Dedicated to the history of the health sciences.

Dental instruments from the illustrious history of American dentistry.

This small memorial is almost as well concealed as Smalls himself was on the night he sailed to freedom.

A stack of stones steeped in Irish folklore, much like the hero they're connected to, hide in plain sight.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

For over a century, it was a crucial center of mental health treatment and also the source of many local legends.

Thousands of majestic trumpeter swans fill this park, sounding distinctly like a certain brass instrument.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Tiny memorials honor individual victims of the Holocaust.

A monument to the man who almost killed Hitler.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

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

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

Minnesota's oldest and deepest mine is now an underground physics laboratory.