Abstract monuments express sorrow and resilience at the site of a horrific massacre in Nazi-occupied Serbia.

A forgotten and crumbling Yugoslav monument to the victims of fascism.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

The largest open-air contemporary art center in Latin America is a unique experience in the Atlantic Forest.

Mirrored floors and arched shelves create the illusion of an infinite tunnel of books.

An ever-growing literary collection housed in the apartment where the Russian author penned his final novel.

A real-life replica of a home from Hayao Miyazaki's beloved movie "My Neighbor Totoro."

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Though technically an illegal structure, this eclectic DIY apartment complex is beloved by its residents.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A Canadian POW for German soldiers during WWII where prisoners hatched an elaborate escape plan.

A remarkably well preserved tower dating all the way back to the Iron Age.

This former lieutenant governor's home is brimming with curiosities.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

A new kind of theme park for adults off the Las Vegas Strip.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

This derelict building used to house infirm Freemasons, their widows, and orphans.

Huge masonic hall in Philadelphia with lavishly themed rooms.