One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

Creaky dinosaurs grow in the backroads of Monmouth County, New Jersey.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Spiral labyrinth hidden in the hills above Oakland, CA.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

The lake that fills and empties itself at random.

Monasteries on rock pillars, once accessible only by frayed ropes.

These tracks are believed to be from a panicked dinosaur stampede.

One of the largest caves in the world open to the public.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A large camera obscura, constructed entirely from digitally fabricated components.

A classically inspired temple in Redwood City.

A piece of John the Baptist in the American heartland.

A monster in the plant world, up to 10 feet tall and smelling of death.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.

It's not your typical library, memorial, or book store.

A Nesting Doll of Churches.

David Sedaris called it "The greatest shop in the world."

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

Taxidermied animals galore, by appointment only.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

A taxidermied stork with an arrow through its neck proved that birds migrate.

An astounding collection of medical specimens, including bits of President Lincoln.