A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

Half-hidden by grassy slopes, this striking Spanish colonial fort is now a museum of underwater archaeology.

Iconic red and white plaques show the creative names invented to navigate the city streets.

Its sunny hues are believed to have inspired the town's color palette.

The first public library in the Americas has more than 45,000 books dating back to the 15th century.

This kitsch eatery is chock-a-block with bric-a-brac.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

Mexico's astounding mummy museum with "the world's smallest mummy."

The stoutest tree in the world.

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

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

An architecturally-focused antique shop.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

These azure waters were thought to lead to the Mayan Underworld.

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.