Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Hundreds of caves once used to store grains and animal feed.

This replica of Columbus's famous ship houses the history of La Palma's maritime importance during the Age of Exploration.

You can soak in three relaxing pools filled daily by the tide.

These wooden balconies that are both decorative and functional.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

Scale model of St. Peter's Cathedral (Rome) in the middle of a small Dutch town.

A medieval village holds a very modern hotel.

This bike path was sunk below water level for maximum wonder.

This giant radio telescope would be a rusting ruin if it hadn't become such a beloved relic.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

It houses the remains of a 17th-century version of the Titanic.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

This heavily worn bas-relief was once an honored fertility symbol.

A man throwing a giant severed hand towers over Antwerp’s main square.

The legendary giant's severed hand sits on Antwerp's popular shopping street.

Because sometimes the most efficient route from A to B isn't a straight line.

An Argentinian businessman facing terminal cancer built this whimsical medieval village using salvaged materials.

With its vast selection of books, comics, and records, this nearly 70-year-old open-air market always rewards the patient browser.

The humble tomb of an Argentine general, hand-built by his son using stones brought down from the Andes.

A cemetery dedicated to the mountaineers who perished climbing Mount Aconcagua.

A brightly colored natural bridge formed by mineral-rich hot springs high up in the Andes.

This park feels like a lush little jungle full of wildlife nestled within São Paulo.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.