This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

Perhaps the most spectacular grotto along the Algarve coastline.

Amazing views of Long Island Sound can be seen from this mountaintop tower.

This opera house along the banks of the Connecticut River has two Tony Awards to its credit but it’s never staged a single opera.

The Connecticut village named for its subterranean thunder.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

Continuing the tradition of the dime museum in style.

A little sculpture with a large wardrobe.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

Founded as a refugee camp, now a popular tourist spot.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Spain's largest bullring offers a unique glimpse at architecture and history.

The "world’s largest honky-tonk" also has its own indoor rodeo arena.

Belly up to the bar in Cowtown, don't forget to buy some boots.

A school-themed restaurant where gastronomy is the core curriculum.

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

The world's largest public collection of PEZ memorabilia.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.