Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

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

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

The final resting place of the great navigator, or maybe his brother.

High in the Rockies the third largest statue in the U.S. opens her welcoming arms, and lights up the night sky.

This incongruous small ferry across the Willamette River north of Salem, Oregon has been operating continuously since the 1850s.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

The highest point in Washington state is a volcano covered in glaciers.

The final resting place of one of the most sensational guitar players of all time was created only after his father got the rights to his music.

The author of Uncle Tom's Cabin was neighbors with Mark Twain while living in this Connecticut home.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

What remains of the simple red brick chapel where the women's rights movement began.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

Statues of Ramona Quimby, Henry Huggins, and Ribsy the dog in the park where their adventures "really happened."

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

This abandoned five-star hotel is now a five-star urban exploration destination.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.