Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

The state's oldest continuously operating museum houses more than 5,000 Civil War artifacts.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

The curiosities and wonders of pharmacy in a delightful historic building.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

Stunning Roman aqueduct used for 1900 years and still standing.

Long tunnels run under the ancient chariot racing circuit to the tower.

This Roman arena once played host to bloody gladiatorial battles.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

The heaviest gold coin ever minted.

Home with Gothic windows featured in a famous painting.

One of the few places in the world home to living stromatolites.

The extensive relics of an ancient Roman and Phoenician fish processing plant hide in a town park.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

A collection of huge Pre-Colombian structures in Alabama.

Famous for its bio-luminescent inhabitants, known as "Dismalites" .

The birthplace of modern China.

A stone woman in a stylized dress honors a courageous politician.

A statue of the Soviet leader still stands in a quiet corner of Estonia’s most Russian city.