The blinking light atop the iconic landmark has been sending secret messages for decades.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

This little blue house pokes out over the campus of UC San Diego, seven stories high.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

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

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

Only hotel where you can legally launder money.

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

This private residence was the template for one of the most beloved television homes of all time.

This painted marvel is San Francisco's 400-foot ode to urban biking.

The remains of a ruined mansion memorialize the 1906 earthquake.

Standing in for the first ship to navigate the Northwest Passage.

A miniature view of the park, caught in time.

The first public library in the Americas has more than 45,000 books dating back to the 15th century.