This historic hotel invented the chocolate brownie.

No one knows how many bodies are in this vault in a Chicago public park.

This kitschy tavern is also home to rare early editions of "Treasure Island."

An icon among Florida's pre-Disney tourist attractions.

A building so large that it has its own weather.

New York City's smallest piece of private property.

Home to items never before seen by the public.

Elevated freight railway turned wildly successful urban park.

The fairy tale castle of the "fairy-tale king."

A fitting attraction for the corn capital of the world.

The curious underground history of keeping Paris clean.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Finland's northernmost zoo is home to the country's only polar bears.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

The whimsical construction on the roof has given rise to many a Montgomery myth about its contents.

Colloquially known as "the lynching memorial," this is the United States' first memorial to the victims of racial terror at home.

Designed by Maya Lin, the memorial honors 41 individuals who died fighting for equal rights between 1954 and 1968.

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

Home to a protest movement, a bombing, and a dramatic change in labor history.