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In this segment:

Phillip Christiensen,
David A. Williams,
Mikhail Zolotov

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Go behind the velvet ropes with Lucy Worsley

Join the popular royal historian for an exclusive tour of London's most extraordinary palaces. From the forbidding Tower of London to glorious Hampton Court to treasure-filled Kensington Palace, Lucy takes viewers behind the velvet ropes into each building's most secret places.

'Van Der Valk' solves baffling crimes in Amsterdam

Set in Amsterdam, new series "Van Der Valk" follows the work of Commisaris Van der Valk (played by Marc Warren), a street-smart and unapologetic Dutch detective who navigates the lively and enigmatic city, solving mysterious crimes using astute human observation and inspired detection.

'Nova' delivers stories from the front lines of science

"Nova" explores new discoveries and how we have come this far on Wednesdays at 8 p.m. on Arizona PBS.