"Holy Wisdom" overlooks the city that became its namesake.

An interactive museum-like experience takes visitors back to 1980s Communist Bulgaria.

A striking symbol of the Bulgarian capital.

An unconventional memorial to the women burned as witches in Bratislava.

An ancient knight and a symbol of the city's freedom.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Quito's historic, main square dates back to the 16th century.

The great polar explorer is remembered in this far northern town, where he embarked on his final expedition.

The tallest bronze seated statue of the Buddha in Japan.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Bridge that died in war and was resurected.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A 125-meter long "tribute to the Brazilian people."

An exhibition devoted to the life (and posthumous taxidermy form) of the last known representative of the Pinta Island Tortoises.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

An ancient capital city that dates back 3,000 years and harbors many surprises.

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

This single room has survived the centuries with almost no deterioration.

The world's only museum devoted to the wonders of fluorescence.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A unique work of automotive art calls this shopping center home.