Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

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.

The ruins of an important pilgrimage destination for worshippers of a Maya fertility goddess.

Since the 1700s, this old barrel has acted as a post box that relies on the kindness of travelers.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

This artistic fountain display pays homage to this area's theatrical history.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

These naturally balancing rocks were pictured on every Zimbabwean banknote, up to the 100 trillion-dollar note.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.

It took 160 years to complete the most ornate church in Ecuador.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

A sharply wedged sundial marks the point at which each day in the United States begins.

The Origin of On the Origin of Species.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

Baroque celebration of the end of the Great Plague of Vienna.