A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

One of India’s largest second-hand bookstores, with more than 600,000 volumes lining its walls.

One of New Zealand’s few castles boasts beautiful gardens, grand architecture, and a history filled with family drama.

New Zealand's epic shrine to all things puzzling.

Tubing through a cave lit with glowworms is a magical underground experience.

A beautiful example of 18th-century engineering still standing tall.

This dreamlike museum is filled with the works of an influential surrealist artist whose name you may have never heard.

Extraordinary sculpture garden created by an eccentric English poet.

The singular ruins of a mysterious lost city.

A massive yet whimsical statue pays homage to the art and joy of "flight."

The population of Southeast Asian primates was introduced to Mexico in the 1970s.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

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

This group of small islands on Lake Nicaragua formed after an eruption of the Mombacho volcano.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

Experiencing Guatemala's sensory-exploding church is a blunt reminder of European influence.

Volcanically heated hot springs.

A legendary tree towers within its own vibrant sanctuary.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

A museum now occupies the mansion in Samoa where the prolific Scottish writer chose to spend the last years of his life.

The world is full of swimming holes, but few compare to Samoa’s idyllic To Sua ocean trench.

The fighters and conspirators that won independence for Paraguay held secret meetings at this historic house.

An underexplored, 130-foot tropical waterfall that you will have all to yourself.

Constructed on the ruins of a convent, this tower saved countless lives.