The house of physicists Paul Ehrenfest was also a temporary dwelling and study for his good friend Albert Einstein.

This little-known national museum houses over 40,000 works of art from across the world.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Little India's hidden gem of kindness and good food.

Colorful umbrella-covered trees in Singapore's Little India look straight out of Dr. Seuss.

Singapore's Ang Mo Kio Town Garden West is a social hotspot for songbirds and their humans.

This rare wildlife haven in Singapore feels like you're in the tropical rainforest.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A slice of central Asia in the middle of Berlin.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

Remains of the old fortification along the Western border of the USSR, now an elaborate defense museum.

Museum deep in the catacombs of St. Michael the Archangel Church is explored by touch, sound, and smell.

The romantic botanic tunnel feels like a well-kept secret.

Moss and stone turn this waterfall into an otherworldly liquid veil.

Check out engineering marvels of the past at this unintentionally retrofuturist museum.

A collection of items from a way of life that no longer exists.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

The Natural History Museum that time forgot.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

A giant portrait of an ancient king looms over the river.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."