Vienna State Opera at night. Credits: Pierre Blaché, CC0, via Wikimedia Commons

San Francisco city skyline. Credits: Lisafern, CC0, via Wikimedia Commons.

Image credits: Andreas Ardnt, Biotronik

Great Ormond Street Hospital. Photo credits: David Hawgood (CC BY-SA 2.0).

Paris. Pierre Blaché by Pixabay

Image credits: SimCardioTest.

Vestdijk, Eindhoven. Nanda Sluijsmans from Den Haag, Nederland, CC BY-SA 2.0, via Wikimedia Commons.

Visualisation of three different steps of the deployment simulation of a self-expanding TAVI device. Credits: Philips Research, Eindhoven, Netherlands. Licence: CC-BY 4.0

“Colours in Innsbruck” (CC BY 2.0) by James Cridland

Image by Mario Zogheb from Pixabay.

Bad Bevensen – Brückenstraße – Ilmenau by Frank Vincentz, CC BY-SA 3.0.

Das Postfuhramt (Berlin). Photo credits: Matthias Süßen, CC BY-SA 4.0, via Wikimedia Commons

Photo by xresch from Pixabay

Photo by janjf93 from Pixabay