A monument to the conquistador became increasingly controversial in the very city that he founded.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

A nostalgic restaurant evokes life in Taiwan from the 1940s to the 1970s.

Life-size animals and furniture made entirely from cardboard fill this odd paper-themed restaurant.

Grandpa Rainbow felt the neighborhood needed some color, so he picked up a paintbrush and went to work.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

The true meaning behind this sculpture remains unknown.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.

Inside this Krakow church, an explosion of psychedelic color.

A layered tribute to the work of mosaicist Isaiah Zagar.

This sculpture of a fisherman spent six years at the bottom of the Schuylkill River.

The oldest surviving presidential residence in the United States.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

A daily replay of the experiment that proved the rotation of the Earth.

The huge collection of paintings of the American West is one of Denver's best-kept secrets.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

A curious building honoring past and current members of a historic musical comedy troupe.

The mosaic floor of a 4th-century synagogue features a pagan zodiac wheel alongside traditional images of a Torah ark and menorahs.

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

Historic funicular railway, believed to be the shortest railroad in the world.

This "synagogue" is not what it seems to be.

This strategically-placed fountain creates the magnificent illusion of mustangs galloping across a river.

Artist James Turrell's ode to dawn and dusk on the campus of Rice University.