With its vast array of freaky specimens that seem to belong in some haunted manor, Philadelphia's 150-year-old Mutter Museum may be the gold standard in medical museums.
But it's not alone.
Museums dedicated to niche medicine, pathology, anatomical curiosities and cultural trends keep visitors fascinated and appalled with their educational and grotesque displays.
Whether it's an oversized parasite, a diseased organ preserved in formaldehyde or a historical look at the outrageous medical practices of yore, there's bound to be an address to discover some sort of unnerving discovery even in less traveled destinations.
In honor of International Museum Day on May 18, here are the world's weirdest medical museums.
Bart's Pathology Museum, England
A university collection started in 1879, this exclusive medical oddity exhibit is part of the Queen Mary, University of London.
It's open only for special soirees and events that fill up quickly. It's even hosted a pop-up cake shop by Eat Your Heart Out bakers.
The nearly 5,000 specimens include various objects pulled from human bodies over the last 150 years -- toothbrush in the esophagus, anyone?
Also on display: the dissected body parts of assassin John Belingham among other relics dating to the 1700s.
Bart's Pathology Museum, Robin Brook Centre, West Smithfield, London; +44 20 7882 8766; open for select events at the moment
Berlin Museum of Medical History at the Charité, Germany
Snippets of Germany's medical history find a home in this restored 19th-century building that houses 1,800 of the 23,000 original specimens that survived World War II bombings.
The oldest artifacts include bladder stones from the 1700s. Other curios include a 60-pound megacolon from a patient who died in 1960, an 18th-century birthing chair and various tumors alongside forms of other disease.
The museum also traces the darker side of German medicine, including how the National Socialists used science to justify their horrific actions toward race purification.
Berlin Museum of Medical History at the Charité, Charitéplatz 1, Berlin; +49 30 450 536 156; Tuesday-Sunday 10 a.m.-5 p.m. Monday, Wednesday, Saturday 10 a.m.-7 p.m.; €7 ($9)
Choowondang Korean Medical Museum, South Korea
Opened in 2008 in a thriving medical center dating from the 1800s, this museum details the history of Korean medicine.
Items including medical chests and documents are on display, giving insight into the development of Eastern medical practices.
The adjoining clinic launched just after the Korean War broke, which was when the Yoon family moved their practice south from North Korea.
A main feature of the building is the herbal-production lab with gleaming metal drums shining through the glass walls.
Choowondang Korean Medical Museum, 153-1, Nakwon-dong, Jongno-gu, Seoul, South Korea; +82 2 3672 2005; Monday-Wednesday, Friday 9:30 a.m.-6 p.m., Thursday 9:30 a.m.-12:30 p.m.; ?2,000 ($2)
Fragonard Museum, France
Originally an anatomy collection for veterinary students begun in the 1700s just outside Paris, the curiosities-filled Musée Fragonard opened to the public in 1902, closing in the 1990s for renovations that lasted until 2008.
Skeletons and anatomical displays fill the rooms, but the main event is in the cabinet of unsettling specimens.