A towering monument in Spain has proven to be more labor-intensive than initially planned.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

One of the oldest libraries in the world is still operating and contains the oldest existing document in the Italian language.

Not far from the more famous House of Juliet, visitors will find the supposed residence of her lover.

Pilgrimage site for star-crossed lovers.

This medieval castle was reconstructed by Carlo Scarpa.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Golden Gate Park's historic collection of plants.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Home to items never before seen by the public.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

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

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

These mammoth-yet-narrow crevasses in the Earth are perfect for taking an otherworldly swim.

Home of the "true" equator.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

Ecuador’s historic seat of government has been quietly looted in recent decades, and no one knows how or by whom.