This beachside town is home to a diverse nature reserve, multiple cays, and one of the three bioluminescent bays in Puerto Rico.

Archaeological sites and great food inside the island's largest mangrove forest.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

The world's brightest bioluminescent bay.

This colorful gate stands as an entrance to the walled city of Old San Juan.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This urban oasis is a marvelous meld of music and landscape architecture.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

Lost subway station nestled beneath Toronto's busy commuter line.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Every year, the colorful murals of Montreal get a complete makeover.

Canada's largest graveyard boasts a lot of noteworthy artifacts as well as its own computerized mapping service.

A large collection of solar and night-time telescopes dot a small area on the Teide mountain range.

The summer tourists on these cliffs are thousands of seabirds.

The most powerful waterfall in all of Europe.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

A memorial museum to the political prisoners who were held at Sighet Prison, once one of the most feared places in Romania.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.