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

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

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

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

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

A museum in the former home of Marxist revolutionary Leon Trotsky.

Frida Kahlo's childhood home, now a museum of her life and works.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

The only castle in North America to ever house European sovereigns.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

History is on display in this hall, which has served as the seat of city government for centuries.

This museum houses two of Mexico's most impressive Aztec monoliths.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

At the time of its completion, it was the tallest dam in the world.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An architect's childhood fantasy treehouse made real.

A historic Montreal market that was the city's agricultural hub for over century.

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

A contemporary fresco movement illustrates the region's rich history.