Birds with backpacks expedite film development for a rafting company on a remote Colorado river.

A view-altering observatory at the University of Texas.

This boulder with a 200-word legal dedication to God has remained hidden in the woods for over 150 years.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

Dancing skeletal figures pay homage to a medieval mural destroyed during World War II.

The cluster of boulders near Fort Irwin is covered in military insignia.

All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

This private home is famous for appearing in the cult-classic "Twin Peaks" series.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

An abandoned Depression-era zoo hidden just off the highway.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.

The only pig museum in the U.S. holds one of the world's largest collections of pig items.

The mystic whose incorrupt corpse still attracts the faithful.

An enigmatic modern marker left next to a historic Roman site.

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

If you want to talk to the Pope you will have to stare down this surreal vision of Jesus rising from a nuclear hell.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

A hospital where antique dolls are given new life.

A Nesting Doll of Churches.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Jesus' footprints and the first catacombs in the world.

A collection of objects supposedly singed by the hands of souls in purgatory.