These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A priceless collection of the Nation's cryptologic history.

A bizarre house filled with an astounding array of collections.

World's second largest particle accelerator, where nature reveals its secrets.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

A science teacher's dream.

These pretty kitties killed and ate as many as 135 railway workers.

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

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Looming communist pillar with a Czech twist.

Macabre astrological automaton clock dating to the late 1400s.

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

Steadily reminding Czechia of its past.

The prototype for all Nazi concentration camps.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The most visited, and possibly most controversial, museum in Germany.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

The final resting place of the poets Shelley and Keats.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.