66,000 pieces of art, donated by one of the world's richest men.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

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

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

In Costa Rica's cloud forest, the roots of a woody ficus create a botanical bridge.

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

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Made of granite, this is a symbol of the Inuit peoples near water that expresses abundance.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

An old bastion at the base of Aguada Fort protrudes into the sea, offering picturesque views.

This precariously balanced boulder is said to be a hunk of stolen butter dropped by the gods.

The painted and decorated towers of this Hindu shrine were once the tallest structures in one of the oldest cities in India.

This narrow street is packed with street vendors and bars selling chicha.

This stunning mass of ice spans 121 square miles and is still growing.

The southernmost postal office in South America.

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

The pedestrian traffic signals in Brazil's teeming metropolis light up with clues to nearby landmarks.

This singular art museum in São Paulo is unique inside and out.

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

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

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.