Eighty million natural history specimens call this gargantuan museum home.

An unusual round church in London with a Templar past.

Northern Ireland's Brobdingnagian stepping stones.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Ride the subways of yesteryear.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Macabre astrological automaton clock dating to the late 1400s.

Read a book next to a Midtown waterfall.

Famously misunderstood wonder of the ancient world

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A museum dedicated to the history and exploration of both popular music and science fiction.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The fairy tale castle of the "fairy-tale king."

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

A walk through the historic city center, under the streets of Seattle.

Elevated freight railway turned wildly successful urban park.

A giant Troll lurks under one of Seattle's oldest bridges.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.