Places frontyardsun Wants to Go

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

A spherical "micro-nation" in the heart of Vienna.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

A non-stop elevator ride in Vienna's city hall.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Dine amidst exotic plants at this former royal greenhouse.

An ode to a chess-loving diplomat.

The remains of an Aztec school and various intriguing artifacts lie below a modern cultural center.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

A series of mosaics in Mexico City's Historic Center celebrate the Basque Country's "eighth province"—its diaspora.

Its exhibits are dedicated to educating the public about state terrorism in Mexico.