A geological mystery on Camelback Mountain.

See massive fossils that are over 200 million years old in northeastern Arizona.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

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

What once sat in the world’s spotlight is today a largely disused ghost complex.

Miraculous tree that seems to sprout out of solid rock.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

20,000 pieces in a Frank Gehry-designed building.

The only arched bridge made of stone on the entire Mississippi River.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Giant, friendly pelicans in Central London, the most unlikely of places.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Mountain where Jesus was first tempted by the Devil.

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

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Steadily reminding Czechia of its past.

Copenhagen's celebrated theme park and gardens.

Massive still life just off the highway in Kansas.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The tallest hotel in Europe.