A massive underwater sinkhole made famous by Jacques Cousteau.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

The youngest volcano in Central America.

This church was transported brick by brick from the ruins of a 16th-century city into Panama City's current historic district.

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

The translucent turquoise hue of these natural swimming pools comes from a high concentration of minerals.

Costa Rica's best known combat zone, used during the Battle of Santa Rosa.

There is an unmarked red button hidden over Houston's Buffalo Bayou that is just begging to pushed...

Once seen as a bit of an eyesore, this sculpture has become a staple of downtown Houston.

The largest underground pedestrian tunnel system in the U.S. mostly caters to the people working in the offices above, but provides a great, air-conditioned way to traverse the city.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

Guatemalan womanizer, venerated during Holy Week.

It’s fun to stay at the YMCA… but at this London outpost, it’s even more fun to eat the Bombay aloo.

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

The ritual has been performed uninterrupted for nearly 700 years.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The childhood home of Earth's alien chameleon is a humble Brixton flat.

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

Artists and musicians now rule over this former rail station.

Hidden beneath the streets of London is a secret subway that only carried mail.

This urban park is home to monkeys and a number of endangered plants.

Strolling through these vintage locomotives offers a surprising amount of insight into the history of Kenya.

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

Just outside of Nairobi lies a large estate surrounded by endangered Rothschild giraffes, who have been fed from the window by Mick Jagger and Walter Cronkite.