The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A historic neighborhood church is reborn as a psychedelic arts collective.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Home to items never before seen by the public.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

A beautiful 19th-century mansion slowly crumbled and became a 'ghost house' after World War II.

This fresco inside a Serbian cave church has been a source of disagreement.

Through the colossal entrance to this cave you'll find limestone tubs and an underground waterfall.

Stone age urban planning.

A maze of underground tunnels beneath one of the most beautiful forts in Serbia.

Tucked in an urban forest, this restaurant specializes in homemade, healing rakijas.

Beautifully carved tombstones fill this unmarked graveyard, uniquely situated near the village's famous stone wine cellars.

This mesmerizing medieval monastery-cave complex sits thousands of feet above ground overlooking a valley.

This fresco-covered medieval monastery hangs from the side of a steep cliff.

This symbol of Yugoslav liberation decorated with 620 carved heads of mythical creatures is now a forlorn relic of another time.