The stoutest tree in the world.

It's believed this golden brick is part of the legendary lost Aztec treasure.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

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

Catacombs turned marketplace.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

This unassuming oasis elevated just above the busy streets of Jerusalem offers one of the best views of the Old City.

The only quarter of the Old City not dedicated to a major world religion.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

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

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

The humble tomb of an Argentine general, hand-built by his son using stones brought down from the Andes.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

These small sculptures pay homage to the lovable star of an iconic Argentine comic strip.

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

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

An expansive book store, art gallery, and curio shop with wares ranging from tarot cards to novelty socks.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.