A cluster of 18th-century temples with an underground shrine.

At certain times in the fall and winter, the sunlight makes this natural sandstone arch glow.

These bronze horses on the gates of the Royal Palace of Naples were a gift from a Russian tsar.

A mythological Celtic beast built with thousands of colorful tiles stands guard over a historic canal junction.

Europe's largest river aquarium features freshwater species from around the world.

The final resting place of the visionary founders of Kelloggs, a global leader in breakfast cereals.

Next to Salt Lake City's Assembly Hall stands a tribute to some unlikely heroes of early Mormon settlers.

Once an erosional cave, this scenic arch was lifted up above the sea's surface by an earthquake.

Copenhagen's "other" little mermaid marks the historic location of past sea maid sightings.

Underneath the well-known Lindenhof hides a secret cellar documenting Zurich's early history.

An impressive site containing some of the earth’s rarest living fossils.

This open-air spiritual sanctuary offers stunning views of Mt. Monadnock and provides a natural and peaceful environment for worship and meditation.

This enormous sardine in the Segura River pays tribute to an annual post-Lent tradition.

People have been making salt here using traditional methods for centuries.

The location of this small park was once the site of an infamous public morgue.

This museum focuses on the history and culture of the German settlers in Pennsylvania.

See the imprints of ancient trees, burned and preserved by lava.

On the clock tower at St. Anne's Church in Cork, you never know which face is telling the truth.

For 14 years, this former stray dog greeted every train passenger that arrived in Fort Collins.

A tribute to Samuel Wilson, who may be the original "Uncle Sam."

A mining camp built around an unexpected occurrence of silver.

This oft-overlooked public artwork depicts another Warwickshire legend.

This prefabricated building was built in Belgium and shipped to Mozambique but was never inhabited, since its iron exterior was unsuitable for the tropical environment.

A 19th-century house filled with secret trap doors and hidden basements has been turned into a museum.