Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

Race through the maze, get your name on the sign.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This black shoreline is made up of exploded lava particles.

Once a WWII supply tramway, it's now a popular & steep hiking trail.

These gardens celebrate the biological and cultural diversity of the Hawai‘ian Islands.

Babe Ruth and others planted saplings for a 1930s tourism campaign. The saplings grew as the area faded.

It took 82 years and four different plaques to finally get the story right.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

A Christian monastery stands on what was once a holy Incan temple.

Across Valencia lie the remains of three ancient fortifications built centuries apart: a Roman enclosure, an Islamic expansion, and a medieval Christian wall.

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

The home where the famous astrologer wrote some of his most telling prophecies.

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

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

This aqueduct with 18th-century origins is integrated into modern life in various ways in Oaxaca.