Underneath this small church are 15,000 bones, arranged by an obsessive academic.

A unrivaled and rather horrifying collection of wax dermatological models.

The tallest stationary dunes on Earth also happen to sing.

The world's largest drain sits below the city of Kasukabe, Japan.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

Thousands of well-dressed mummies below a monastery.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

Huge hole looks down onto an underground beach populated with sea lions.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

The museum chronicling a treasure hunter's dream, fulfilled.

A sweet museum focused on beets.

This miniature Paris, built out of trash, is one man's two decade labor of love.

A curious collection of locks and keys.

A botanic garden full of trees twisted into fantastic shapes and positions.

A strange history museum, with items accumulated by a pair of globe trotting spies.

The history of funerals and funerary customs.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

A fitting attraction for the corn capital of the world.

Tiny castle in the middle of the Rhine made you pay to pass.

Penn State's giant bug collection.

An experimental, automotive replica of Stonehenge.

A stockpile of childhood lunch pails turned collectibles.

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