Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

A library and museum dedicated to typography.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The stunning interior of this Gothic church is covered in ornate gold details.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

Hundreds of pieces of ancient Taíno art cover the walls of this Caribbean cave system.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

Cavernous opening completely encased in Karst limestone.

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

A massive underwater sinkhole made famous by Jacques Cousteau.

An important Mayan religious and trading center dating back to 200 BC.

A natural swimming hole that was once a ceremonial center for Mayan priests.

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

A vast necropolis where you'll find the elaborate mausoleums of Argentinian tango stars.

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

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

A beautiful young girl said to have been buried alive in her coffin…

A gateway to a mysterious network of underground tunnels.