My mother is an ICU nurse, did rotations in ER and NICU.

ER was essentially a more concentrated version of what she deals with in ICU, NICU broke her though.

Top stories from the ICU:

• "This chicken is tough" (from a no solid food patient): chewing on condom catheter.
• The detox guy. Went in to violent DTs to the point that the pharmacy tech was sent to buy a bottle of grey goose while the pharmacist did the math of how much to add to 1L saline bags to keep the patient from dying from DT. He was there for damage caused by drinking listerine after his wife had dumped his booze.
• Assorted "you're kidding right?" family stories. Your relative has been mostly dead all day, no they aren't going to be able to go to wherever tomorrow/next week.
• More than one anal fissure turned septic. "Guess the object" ensues.

Of course she also had heartwarming stories about people getting second chances on life and such.

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The TL;DR: is I don't think there's much on this planet that can phase my mother medically... as long as it doesn't involve babies.

>hundreds of millions of dollars each to build

About $1200 per square foot to build for perspective. Nevermind operational costs of several hundred per square foot monthly.