A bibliophile's heaven that contains hundreds of bookstores, offering over a third of secondhand books for sale in Tokyo.

University City's quirkiest resident lives in a park named after its first.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

This is not your typical jungle gym.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

Less a museum than a bizarre fantasy world created by artists and engineers.

An abandoned company town and cement factory outside of Bogotá, now haunted by ghosts and scofflaws.

This small bridge serves as a symbol of South America's independence.

A lighthouse marking the northernmost point of continental South America.

This colonial town in Colombia sits around the largest stone paved square in South America.

Cathedral carved out of salt, located a mile below the earth's surface.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

The land is home to swimming ponies and a legendary 18th-century treasure.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

A beautiful but toxic fountain of mercury.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.