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

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

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

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

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

The stoutest tree in the world.

This beautifully deceptive waterfall is something far different from what it appears to be.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.

Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

These winged Maya figures are the subject of speculation and conspiracies.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

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

Site of James Cook's historic observations of the 1769 transit of Venus.

This beautiful example of neoclassical architecture is one of Uruguay's most treasured cultural gems.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

This public elevator links the lower city to the upper city of Salvador.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A bright little alley in La Boca is a part of tango history.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

The platform atop this verdant volcano was built with the help of a royal elephant.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.