This pole near the infield rail at Belmont Park marks the jaw-dropping margin of Secretariat’s 1973 Belmont Stakes victory.

One woman's Viking Castle on Lake Tahoe.

A home covered with elaborate mosaic and other pieces of art.

The beautiful behemoth is one of the largest trees of its kind in the United States.

When this 160-year-old church was being built, a stonemason included a hidden homage to his late daughter.

This enormous sinkhole hides a secret world created from divine wrath.

A former special storage facility for documents during the Cold War.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

Perhaps the most spectacular grotto along the Algarve coastline.

This plaque commemorates the call between Alexander Graham Bell and Thomas A. Watson.

This Roman archeological site is hidden amid a 1930s housing estate.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

This exhibit allows visitors to wander through the interior of a replica Ice Age glacial cave.

This historic stone barn is the former home of legendary cattleman Charles “Lonesome Dove” Goodnight.

The ruins of this medieval castle overlook the lake of Piediluco in what was once a sacred forest.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

According to local legend, a tree grew from the stake that killed this alleged vampire. In reality, he probably died from influenza.

At a lodge and RV park is a collection of headwear that comes in at more than 11,300 and counting.

This museum preserves over-the-top masterpieces that once qualified artisans for membership into a medieval guild.

At the height of alum production at this factory, human urine was a valued commodity.

Narrow passes cut out of mountains surround the medieval capital of Japan.

The only place where can you share a seat with the bums of the Fab Four.

This ancient fortress was once the setting for a strange battle won with the help of a lizard.